This seems like an interesting one. Everything seems well polished, and my only two critiques are the lack of a tutorial (beyond the how to play text) and the lack of sound effects when attacking. Aside from that though, it seems like a neat entry with a lot of depth to it!
On a different note, I do wonder where all of the Tetris ideas came from for this jam. Not that there's anything wrong with Tetris, but I'm somewhat confused as to why so many people came up with the idea of incorporating Tetris elements into their games. XD