Losing interest by the 2nd play through, done by the 4th.

There are only 3 different playable characters, all with very minor differences.

There few weapons and weapon augments so it't not a lot of RNG, its not a "what will i play this round?", its a "when will I get my build?"
You max out on crystals 60% through the run with nothing else to upgrade, with no further upgrades so you just feel weaker and weaker as the run progresses.
Game becomes ridiculously easy after the first 2 runs when you figure out the build which you can just repeat every run.

This is a fun bullet heaven. Considering it's in early alpha it's in a really good state. Below notes are for the developers:

* Progression towards the final boss is way too long. I felt that I've been repeating the same stuff over and over again.
* Roulette is a really cool and simple mechanic - it's like looking under the hood of RNG engine.
* Mission objectives are cool, because it forces you to clear the objective and finish the mission. That said, what are the differences between "kill flying monsters", "kill mutated monsters", etc.? It would be great that the player has to work towards a goal. For instance if I were to kill ranged monsters, make it very clear that there will be a ring of close-combat units surrounding you and you have to escape it after some time, as ranged attackers only gather when you are inside the circle. The same goes for "activate support" and "activate light towers" - there are both about running around searching. Maybe something different?
* Add special towers on the map so that the player can choose whether to stay under the tower to get some boost (more DMG, more HP regen, better drops, etc.)
* Very far into the game I learned that there is a difference between hand-held weapons and drones. I am daft (because you can see the drones even in the between-mission screen), but still this should be visualized much more on the weapon tabs.
* There are quite a few weapons that are underpowered or boring to even choose from. You have the statistics so you should know.
* To be honest I was a bit sad that the last level of weapon upgrade doesn't do anything cool. Or maybe there could be a way of getting special bonuses by combining more than one weapon?
* Game is not quite balanced when it comes to bosses. The charger is horrible and the only way to defeat it is to kite him behind a building. This works, unless you got the special (super-HP) monsters which happily kill you when you try your best to avoid charger. Rest of bosses is relatively easy (even the last one).
* I failed to see a post mission report. It would be great to see DPS statistics, debuffs applied, who dealt most damage to you, how much you've healed per second (to compare healing mod on different weapons).
* Why not to be more bold and make venturing through the map more interesting? More unique locations to go through, more branching paths: do you want to go to this biome or that (different enemies, rewards).
* Taking into consideration the ease of switching equipment (and lack of shop to sell equipment to) it would be great if more tactical thinking would be required. Why not make units resist different types of damage (physical, explosive, fire, frost, electric)? Why always throw more units - maybe some maps would have less monsters, but stronger so single-monster weapons would rule supreme. On some hot maps a weapon like the laser would have a considerably longer reload time (overheating). Various spots on the map could limit your mobility.
* I am bit worried that subsequent runs won't be much different from another. I am not playing the second character and we will see how it goes. It's hard, I know, but still: maybe limit weapons/blue upgrades/golden available per each character?
* I accidentally got the "progression rewards". Please, make it much more noticeable that I can click on the top of the window to collect a reward. Couldn't we even make it automatic?
* Did I mention a shop? It would be great to sell some weapons/mods and buy things you really need.
* It's damn hard to see important monsters (the high-HP ones) that will hit you when they get close. Maybe set their Z-order on top of everything else?
* Too many enemy projectiles. Most/all of them are not worth dodging. Less projectiles, slower, hitting harder.
* I don't understand the requirement: "Kill boss". All of them? Anyone of them? Specific one of them?
* "Keep life over 60%" suggests that you cannot get hit too often. While in fact it's "At the end of the level you have to have more than 60% health". Are we allowed to teleport earlier?
* Maybe some special mods to modify the behavior of drones?
* It's very easy to get too much of crystals (when you invest into them), so the only thing left is to reroll a lot. Maybe an expensive shop?
* What is the Luck stat and what does it affect?
* Very uneven progression point distribution curve. In the beginning you get a lot, but later it's extremely hard to get any. Lvl 200, 2 bilion enemies, etc. Maybe some interesting challenges which you could be able to do a few in one run? Use only single gun or two? Don't use lvl 5 weapons. Use up to 4 mods only.

Review in progress.

TL;DR: It's not a bad game, it's just not a particularly great game. Maybe on sale.

Good things first: I like the art style. The setting concept is fun and fits well with a roguelite experience. The character designs are nice, if generic. The core ideas aren't bad. I really liked that the gameplay is set up in 3-5 minute bites. I only ran into one major bug, and it was due to some weird combination of keypad and keyboard buttons being hit at the same time.

Now the bad: It feels wholly inessential. Get guns, strap them onto your mech, upgrade them with pickups, improve your core stats. Get some non-gun upgrades to improve some stats and maybe lower others. Pretty standard Survivors loop.

The problem is that there's just... nothing there.

With two exceptions, I went through four whole runs (one unsuccessful at the beginning, two successful "regular" runs, and one done as fast as I could) and I could not tell you why you should prioritize any stat over another. Pick four random mods per each gun and go; it just doesn't matter. Oh, they might change what the gun does, even in a visible way, but I literally picked random guns on my fourth run and threw random mods in. No difference.

There are four characters in the game, of which it looks like you can currently only unlock three. One says its under development, but who knows if that's accurate. Each character has slightly different stats, a different starting gun (which any character can find in pickups), and a special that sets them apart. The first one has a dash, the next has a big missile attack, the last has a character-centered AoE. That's it.

No "this character does more damage with close combat, that character does more with beams, the third likes fire weapons." Oh, one of them says she really likes explosions, but that's just a way to say "this is their special." Certainly nothing as interesting as "this character carries more guns but gets fewer mods" or "this character gets a bonus for having the same type of gun on multiple slots." Nothing to lead you to build one character different from the next, or at least nothing major.

The missions at first seem like they might have something interesting going on. You have to survive a certain minimum amount of time in a mission before you're allowed to exit, and each mission has two bonus objectives. The bonus objectives are pretty anemic, though: activate one of two different types of helpful structures, which you're already incentivized to do; or destroy X number of some type of enemy, all of which are actively running towards you anyways. There's one that's a little different, killing nests, but you just kind of sit next to them and wait for them to die.

Speaking of waiting for them to die, the bosses are dumb-as-rocks bullet sponges. It's trivial to get the charger stuck on a rock or a light tower and shoot them from behind it. The ranged bosses have a ridiculous windup, so as long as you keep moving, you'll be fine. You can get fast-moving or charging bosses stuck on other bosses, too, so it's possible to literally hide behind your enemies. Even the big boss at the end offers no significant challenge.

There are some interesting ideas here, but none of them gel into an exciting game. I wish they did; I'll be keeping an eye on it as it moves to 1.0. Absent some huge changes, though, I can't see it being worth buying unless you can either get it very cheap, really love mecha, or have exhausted all the A- and B-tier roguelike/survivor games out there.