Hey, congratulations on getting your first prototype out there! Game dev is pretty difficult - it's a pretty big accomplishment to publish something that's playable at all. Many people never get that far.
As the other commenters have said, this is clearly an early prototype. I think it's going somewhere, though. Jumping seems decent, and I like the fancy hit and death animations of the enemies, though hit detection still seems a bit dodgy. Keep it up!