Hi, just finished a run in your game.

I downloaded a couple of demos, and this is the only one that gives me the desire to come back to play again (besides Haven and Webbed).
A crash happened while I was playing yesterday, but tonight when I launched the game again to start over, the progress was saved just a bit before the crash (relief!).

I liked a lot the quick and simple style of the game (reminds me a bit of nova drift, but lighter/more relaxed w/ bigger maps and defence mechanics).

For a Demo I think it is great! But for a full game (if its not going to be f2p) I suggest adding more content (but I bet you already know that) and letting people customize their runs as they finish/unlock more things (harder, easier, funnier, weirder), for me it seems like a trend in roguelikes these days.

And about balance, I thought the TimeReversion power is much better than any other power of the ships I had (sidekick, "buzzsaws-saucers", the 2 starting ones, 1 I can't recall and the time traveler ship). They feel interesting, but the timetraveler seems op (Undoing your recently ship damage and ammo spent is so good)

Good luck with your game and I hope the best :)