This is one of the best games I've played in the jam, even if I found it pretty hard!
For some reason it took me a while to realize you need to just spawn unwanted tetronimos, I assumed there was a button to move to the next one. Once I got that, it was pretty easy to control.
The design of using tetronimos feels really good, it's a really good idea I haven't seen done before.
But I found it quite hard! I feel like having some more basic challenges at the start without enemies would let people get to learn the game easier.
I really like the art and it feels polished without being too animated, which is what a lot of games fall back on. It's stylish which I like.
Overall, this is in the top #3 in the games I've played so far. Good job, and I'd like to see more of it.