it's called junk, and the premise is... well, here's the description from the itch page:
Junk is a variation of the familiar falling-blocks puzzle game. When you start a game of Junk, you don’t play on an empty board. Instead, you play on the finishing board of someone else’s game. And when you’re done, any mistakes you make, all junk you collect, will become another's problem in due time, for all time.
you only get to play for two minutes at a time, so one person can only fuck things up but so badly. you get to put your name in too, so the last player can see who fucked things up right before them. watching all of the junk pile up at the beginning is... very satisfying, but also kind of horrifying?
check it out! the creator, y2bd, has one other game on their itch page, if you want to check that out too.
