I have a confession: I found a bug, in that you didn't set the pause/highscore menu to freeze the game at all, nor is your score "locked in" upon losing; so you can just keep playing and ignore the menu lol.
I'm not actually sure how someone would get a score higher than about 400, because the coard very quickly becomes almost all pitfalls and -health tiles. Still though, I had a lot of fun!