It's a cute platformer, I played all the way through.
Unfortunately the level design leaves a lot to be desired, the game never really introduces any mechanics (except moving platforms which are barely used at all) which leads to the stages being basically the same all the way through. The only stage I really remember is the vertical one right at the end, so I think it would have been a good idea to try doing some other stages that change the level structure a bit.
The combat is unsatisfying because it lacks any sort of timing of other skill-based element. This is particularly harmful because combat is really the only thing to do other than platforming. It would have helped a lot to at least introduce some enemies with different movement patterns throughout the game.
The bosses are a nice addition though the second one did feel a bit unfair, it took me a few deaths to figure out how to avoid the downwards attack.
It also would have been nice to be able to make the camera peek up or down moving the arrows since there were a few times I had to make a jump without having any idea what was below me (occasionally resulting in me landing right on an enemy or dying).
Other than that I found it a bit obnoxious to have to switch to using the mouse to navigate the menu every time i died.
Sorry if this comes off a bit critical, as I said I did beat the game and I found it pretty enjoyable.