OMG! I'm so lucky to have discovered this game! This might be my favorite (and I played a lot of them). While I was playing it, I could feel just how funny it was making this game, probably laughing all around while imitating your professor. And I love that all the levels are related to the lecture and the whole concept makes sense, when you need to erase all your doodles before the professor sees your. The game is also perfectly balanced, not too hard and not too easy. I think you should make player hitbox a bit smaller or enemy hitbox a bit bigger. It was really hard trying to stab those big triangles and not get hit. But all in all, thanks for this game, I enjoyed it a lot!