Art looks great! Game feels pretty good for the most part. The tutorial section helped a lot, but I did have trouble getting used to the three actions. Good job with the balance. I think the spacing of checkpoints was just about perfect for something like this. After the tutorial, each felt like a stretch to get too. But not so long that I'd get demoralized after dying. And the checkpoints seemed placed so that goofing up the beginning meant you could easily reset the timer while preparing for the next attempt.
Only real complaint would be about wall jumping and the size of openings. I'd often find myself trying to jump into the opening from a wall jump but jumping too high and hitting the ceiling and then not having enough horizontal velocity to make it into the opening, so I'd have to try again and wind up burning a bunch of time.
(And I did notice that if you walked off a platform and jumped you would do the normal jump rather than hover. It didn't really cause a problem, but was definitely not what I was expecting)