Really solid idea, I know the idea of the Jam was no control, but maybe have player have slightly more control as to where the blocks go? Also maybe a restart button wouldn't go amiss cause I wanna beat my high score.

I'm impressed by how good you got the physics to feel (I always struggle with unity physics), the stacking mechanic feels snappy enough to be fair, but bouncy enough to be a little goofy, which is great. Did you ever consider making the shapes spawn on a timer? As it is it's a pretty chill game, not that that's a bad thing though if that's what you're going for!

would be a good mobile game!