The idea is cute. The fighting is a bit basic and could use some additions like dodging or maybe a magic spell to spice it up a little. The overhead UI could be rendered by a second camera, so it does not clip into the level geometry. Sounds are good but a bit loud; an in-game audio menu could help adjust that. The room with the spikes should have at least one method to cross without taking damage. It's mostly a bad idea to force damage on the player if it's not a risk/reward type of situation (like the spike doors in Binding of Isaac, for example). The number beside the HP bars is probably meant to represent a level, but if currently, there is no way to increase that level, there's no point in showing the number right now. Given the very basic combat system, I think a quick and easy way to improve what you have would be to make the enemies deal a lot more damage so it offers a bit of a challenge. The minimap on the first level is in the top left corner, and the minimap on the second level is in the top right one. Try to keep it consistent in your games. Overall, it's a cute project though, good job.