This was great! I liked the innovative level design, pushing the upgrades into strange little nooks over and above what I thought they'd be used for.
The palette and graphics in general are also really nice, and the controls felt sharp and responsive, except for the wall jump, as had been previously mentioned, which I also struggled with sometimes. Perhaps it needs a more generous distance from the wall where it'll still work, or maybe the player should press into the wall rather than away from it to activate it?