The basic concept is solid, the gameplay loop was a bit too repetitive if you ask me. Throwing in at least one other way to interact with the world would be good. Something like an way to upgrade or something. Another option would be to nurf the fact that you start will full health during every encounter. Then you would have to rely more heavily on healing, especially in later stages.
Having some way of hinting at which gate would feel more fair to me as well, otherwise it feels like I'm just going to keep fighting the same guy again and again and it is just a process of elimination.
The art style and music was very fitting, everything worked as expected, can't be said for a lot of games during jams (mine included haha).