I've never played a game quite like this, so the mechanics were really interesting! As others have pointed out, some sounds and music could round off the game nicely, but I also appreciate that considering the cool gameplay you came up with, there probably wasn't too much time left.
I did struggle with the movement keys. I'm not sure how to improve this, or if it even needs improvement. It just always felt awkward and I kept pressing the wrong keys because I'm simply lacking the muscle memory for purely diagonal movement in video games. But once you add more levels, it'll give the player even more time to get comfortable with everything, so there's that.