Great presentation, the art is very consistent. For those having difficulty with the controls, I 100% recommend plugging in a gamepad (my enjoyment level increased increased dramatically after I did).
One thing to consider is having a slightly gentler difficulty curve by having the ball follow you slowly in the beginning, then faster as you pick up orbs. Also I think it might be nice to have the player respawn move to a little further into the level with each orb collected. Getting reset all the way to the beginning when you're on orb 3 is a little brutal.
The only place where thought the game was a little too punishing (like in an unfair way) was in the 3rd orb room. The height of the wall jump is just a little hard to nail and the margin of error is so so small. I think lowering the wall here a fraction would dramatically improve the feel of this obstacle.
Super impressive overall!