ok, im gonna give feedback on seperate comment so that the different issues can be discussed in a more organized way.
the first thing i noticed is that the fact of having to control the player with wasd, and having to press the spacebar with that same hand is really uncomfortable and makes my hand hurt.
what i would suggest is having the jump be mapped to the W key so that the left hand controls are all close to each other and don't break your hand.
or having the abilitty to remap controls but that of course would be more complicated.