I gave this a try, but I am really not a Tetris person so I can't provide much feedback. Spent 45 mins and almost made it past level 2...
Some notes:
- The knight freezes randomly sometimes, but you can still control the tetrominos. I can't reproduce it; it felt very random
- There should be a Start/Escape menu to restart the level
- When you hit an enemy, I kept thinking that the hearts represented the amount of damage being dealt rather than the amount of health left
- There should be some kind of red warning bar when you're at low health because it's easy to miss this
- The green warning for when you're about to void yourself is extremely useful
- It's possible to wall yourself in if you don't have enough actions, but I guess that's part of the design. I wonder if the game should end if you enter an invalid state like that. Honestly not sure.
The visuals and UI are nice, and I can see how there could be a lot of depth here. For someone who knows how to play Tetris. Apparently that's not me! It was a cool experience though.