Game of the Year - 1982
Game of the Year - 1983
Game of the Year - 1984
Game of the Year - 1985
Game of the Year - 1986
Game of the Year - 1987
Game of the Year - 1988
Game of the Year - 1989
Game of the Year - 2025

I'm far, FAR from done with this game, but I have to add my review to the aggregate here...

TL;DR - This game is an absolute steal at $25 full price, with the price essentially making the asking price $.50 a game. The mental gymnastics required to rationalize this game not being worth it on that alone is astounding. But what you get here isn't a game with 50 mini games Wario Ware or Mario Party style, but it is, in fact, a collection of 50 full games. They are retro-inspired, will usually have 1 or 2 obvious inspirations, but will also add some crazy twist or innovation on top of it to make each game uniquely their own.

Half of the games have multiplayer modes, which are phenomenal on a TV via the Steam Deck dock and a couple of bluetooth controllers, if you have those. I'd say the average quality of game here is around an 8.5 outta 10, with a couple 9.5 & 10s, mostly 8 to 9, and a couple of 7s with one or two 5 or 6s. So, pick this game up and start discovering which games vibe with you. You won't be disappointed.

A large appeal to this game (and what I think the devs were really going for) is that you have limited knowledge of these games going into them, as on the main menu they'll just tell you the genre, a short 1-2 sentence description, a short 1-2 sentence fictional historic factoid on the game, and an extremely brief explanation of the controls. UFO 50 wants you to disccover these games for yourself and figure out the mechanics and game systems on your own. It's an emulation of when you would rent games at Blockbuster or if you found a cardboard box of random old games in storage or at a flea market, and you would rotate through the games without a manual, without internet, and just figure out what the hell you were playing. The game nails this obscure experience perfectly.

Adding to the replayability of a lot of these games (some are arcade-y, others more campaign-based, with some of them being 10-30 hours in scope), there is a soft-achievement system with each of these games as follows:

Dusting them off: You played the game at least once
House Gift: You accomplished some basic goal in the game, typically around 30% completion that requires a deeper understanding of the game mechanics. The reward adds a little gift for this bonus screen on the main menu where a little tomogachi guy hangs out in a house that becomes more furnished as you get these achievements
Gold Disk: You beat the game in question
Cherry Disk: You go above and beyond, 100%-ing the game in question

There's just so much to do, and experience, and figure out here, that this really is a must buy. The only downside to this collection (and I'm not even sure if it is a downside, really) is that the collection gets better the more you play, experience, and figure out. Meaning, that the worst part of the experience is probably going to be the first two hours, as you will be confused, still trying to pick up what the game is going for, and you will probably have only played Barbuta, Bug Hunt, Ninpek, and Paint Chase (not that there's anything wrong with those games, they're just the first ones listed in the collection, and chronologically the most simple and archaic thematically).

Anyway, the game is more than a sum of its parts, and I'd give it an easy 10 outta 10. 60-70 hours in, I have all the House Gift achievements, 8+ hours of playing multiplayer (really a great time, get a fren or waifu IRL and get to it), and am about to set off trying to Gold all these disks, which will probably take me another 200 hours, haha!

There is a Gambling Simulator in this game,
There is Spelunky 3 in this game,
There are 2 Golf games in this game,
There is a better NES Metal Gear in this game,
There is Binding of Isaac in this game,
There is Streets of Rage 5 in this game,
There is a Horror Game in this game,
There is a Star fox Game in this game,
THERE ARE SO MANY GAMES IN THIS GAME!