I think I've seen many other games with this same interpretation of the theme, but I like how you made it a sort of balancing act where you had to level the player but also not kill them. Thing is I often just found myself spawning a few enemies until the player reached max exp, then waiting like 20 seconds for the level to finish. In that way it wasn't that fun, but I guess if you tried adding some more mechanics to this it could have some potential. Like the music and stuff too btw.