right of the bat its pretty god but i would change a few things:
1. there should be an option to change the jump from the space bar to the up arrow, your hands are already kind of everywhere b/c of the mouse.
2. the character should be visibly jarred, shocked, or change when hit
3. the character changes direction based n what direction you are walking in, not based on where the mouse is.
4. the jumps should be varied. longer you hold jump key=higher you go
5. it would also be nice to be able to change the combat things to z and x or some other thing