If you did the art and music yourself, that's immensely impressive. I would bet a tenner that you didn't, though, so please either give credit to whoever did or come to me for your tenner.
It looks fantastic and the movement's good but there are so many small details that spoil the fun and make this a frustrating experience:
-I saw in your comments that the arrow keys worked, but not before I attempted the game's recommended control scheme of AD and Q. Hands do not work like that!
-It's not satisfying to have enemies who die a second or two after they're hit.
-Blind jumps should always be avoided unless you give some hints (like coins sometimes do in a Mario game),
-Making the player use the mouse to skip dialogue in an otherwise keyboard-only game is annoying.
It feels like you could put out a much better game if you just gave yourself a bit of thinking time to pay attention to the small details.