Pretty cool concept! The limited bombs made it very strategic, and since the tetris pieces are all automated, it's a pretty chill game. I couldn't master the timing getting blocks mid-air, so my strategy was mostly wait and use bombs carefully to clear any stacks with least # of bombs possible.
Has a bit of roughness around the edge, which is normally not a big deal but a couple bugs impact gameplay:
(main one is actually instant-gameover when the tetris pieces switch from Left -> Right falling mode and instantly overlap) you can see at very end of the video [4:27]
The other UI glitch was seeing the echo tetris pieces that are stuck on screen and the yellow highlights in the middle - for a minute I thought I had to stack tetris pieces to fill the yellow squares
Overall very fun and challenging game! Nice work!