Tried playing the web version but the menu was very laggy and when I finally got in it looked like this. Refreshed and had the same issue. I can download and play just fine though.
I can rotate a piece forever to keep it frozen in place, seems unintentional.
Also there should be a penalty or something to prevent me from playing the "tetris" part of the game first, with no thought on the knight, until I clear enough lines. Right now it feels like I can play tetris (ignoring the knight), and then once I've made an exit, play the dungeon part of the game (and ignore tetris).
Still fun, I'm just bad at tetris.