Fun game, I enjoyed it a lot, loved the art style too. I was already thinking of commenting that the last round was the easiest, then I discovered it wasnt XD
Anyway, in my opinion the first round could be a little bit easier, so its more likely that the player will discover the second and third enemies and also could be nice to put in the paper of the wall like ROUND 1, ROUND 2 or ROUND 3 so you understand better that it shows the competitors and that there is more than one.