Brilliant game, both in terms of the idea and how you designed around it. I initially wasn't understanding when exactly was I "meant" to play the tetris part and when should I move my character instead, but a run of endless mode really cleared up all the tradeoffs at play there.
My only minor complaint is that I wish that was possible to hover onto or select a grid piece to read information about the enemy/object standing on it, but apart from that, complimenti!