I really like the idea here. My only issue was that I couldn't really grasp what the connection was between the block types, and their potential success, or destruction. I didn't find the descriptions of the block powers particularly helpful either in that regard - other than to realise there was a % chance involved in successful placement (which in fairness is appropriate for the jam theme).
I'd love to play a version of this where the only randomness is in the initial block roulette, leaving room for more strategy in the placement side of the game - I think that could be super addictive, and with a bunch of powerups and additional block types, you've got yourself a hit.
nice work!