Fricking
THAT was the name of that game!!?!
For some reason, this very recently popped into my head as a "Huh, whatever happened to that game..." thought. (I was thinking back on this, and also the Super Mario Crossover spiritual successor Super Action Squad / Glitch Striker, which I guess
Exploding Rabbit is still making?) And I tried to find it, but you have no idea how worthless searching for "50-Games-in-One Game" or other variations of that title (well, I guess you could google that and know in two secs, or just guess that it's worthless) when you can't remember the name of the game.
So glad that UFO 50 is still happening. It's been ages, but I'm still very into all the 2D gameplay experiments and homage variations they're trying here.