I liked the overall vibe of the game :)
I had two things that I noticed: 1. it was weird that you can not fall down at the sides of the maps, I think it would have made the game more challenging. And 2. I think when you collide with an enemy it creates a bug where a second enemy can jump on non existent ground tiles - in the air - esentially removing it from the map as a threat.
I think it is a good base for a game, hope you continue development!