The controls feel a bit odd for me. The jump & space keys work like 70% of time. Also I didn’t realize the up arrow does the jump, since the space key is usually used for jumping but here it is used for other thing, so I figured there is not jumping in the game :D Maybe reassign them somehow or just put a tiny survey of controls at the beginning of the level (for those who didn’t notice the “instructions” menu).
Nonetheless, good job!