The art and the music fits very well together, the gameplay was fun but could use some polishing.
I would say the main problem area is the camera, or specifically that it was tied so closely to the jump.
If the camera instead follows behind the character in a slow(lerped) fashion it becomes easier for the eyes to register the enemies and calculate when to jump.
There are great talks on camera movements on the Game Developers Conference (GDC) youtube if you're interested. One that I would recommend is "Math for Game Programmers: Juicing Your Cameras With Math". But I understand that it is a game jam, and that there are only so many things you've got time to add in this far too short week :)
Best of luck on your next project or if you decide to keep working on this !