Proto-Jumping Flash with some slightly cruel goal placement. Feels super weird to control at first but then somewhere about a third in it suddenly just kind of felt natural? A weighty platformer on the GB of all things doesn't have any right to feel this good, and the music is solid. +.5 star for the hilarious translations, I won't spoil the two lines it throws at you but they're cute.

I'll just mention here too, but the bonus game is a matching game, the blocks emit a tone and you have to try and match it to another block of the same tone; the timer on these is ruthless and I only successfully completed one with one use of rewind lol, in the end I don't think i really got anything for completing the bonus level.

Highly recommend as a quick pick-up-n-play game (est completion: 30-40 mins), or if you're exploring the GameBoy library any deeper than what Tumblr said was good a decade ago.