I would have prefered "jump" on the space bar personally. I kept dying immediately because I would hit spacebar instead of "W", also, there seems to be a collision issue at the bottom of the first jump, since I can stay alive
"Breaking platforms", there's no indication when they are breaking (nothing visually anyway), so it's hard to gauge when they are going to break.
I pressed "E" immediately after getting clone, and it looks like it bugged the whole game as I couldn't get the platform to go down before the "double jump".
I was sad there was no music/sound FX.
Overall, it was a little frustrating. I love the art style and how you did the tutorial step by step.