Really nice artstyle and polish - nice game mechanic, it would be great to see this expanded to use more keys on the keyboard.
For example maybe something like this:
top row of keyboard (QWERTYUIOP) for whatever the jump key is
left row of keyboard (ASDFG) for whatever the left movement key is
right row of keyboard (HJKL) for the right movement key?
Would be great to see more levels and worlds :)