I like the idea, but the game physics could have used a bit more time in the oven. half the time I die from jumping on top of blocks, which totally shouldn't kill me. I think the game would also be more enjoyable if the tetrominos (not really tetrominos here, I saw some pieces that didn't have 4 tiles) were fused together.
I don't think the tetrominos should have bouncing physics too. I am not familiar with GDevelop, but I bet there is a way to make the pieces not bounce when landing.
Anyway, great job on submitting to the jam!
Edit: I realized that what I was dying to were the red tiles, and the yellow tiles would vanish when touching them. It's a fun twist, but try leaving some kind of info about this game mechanic in game or the itch.io submission page. You can also use gaming conventions that everyone can recognize, like making that tile look threatening by changing its look to something that clearly screams "you will die if you touch me" or "I will collapse if you touch me". It's important to explain these things to the player, explicitly or implicitly.
Edit 2: Another thing you can add is to map more keys to move. In a game jam, we don't have time to implement a custom key binding system, so it's important to give multiples key bindings to play the game. WASD is pretty standard, but if you can salvage the time, try mapping arrow keys too.