The concept is so cool. I love it. Extremely sweet and seems like a passion project.
The fact that you have keybinds already makes this so cool. However, a bit more touched up main screen would've made this game much more deeper. Maybe writing a main screen that seemed that it was written/drawn by a little kid would've added more depth into your concept.
I love the camera moving as you go through, and I love how the game plays exactly like mario where you can jump over your enemys to kill them.
The jumping feels a bit off to me. Like it has to be extremely precise to get where you want to go in the level. Might just be a skill issue. One thing too is that when you go to a new camera view, sometimes enemys are just there or holes and you just immediately go into them because you are pressing forward. If you maybe put them a little later after the camera switched that would be fixed.