Wow, was really impressed with this game! Feels like you were going for 2D Mario 64 and, as strangely backwards as that sounds, it felt like you pulled it off pretty dang well!
It certainly took a bit to get used to the controls since there are so many movement options in place which can be quite overwhelming (especially since some of them double-up, like the long jump and the dive) but once I did, thanks in part to your great tutorial zone, I was having so much fun just playing around by itself, let alone making it through these great gauntlets you've setup that make you use everything in your arsenal in fantastic chains! It just never got old or stopped being fun since you kept shaking things up with tons of secrets and new mechanics and tricks, and the controls felt very smooth with just the right amount of subtle air control influence to allow a bit of wiggle-room for adjustments. And even a cool boss fight for the ending (which I wish had maybe one more phase)!
It did have some rough spots here and there. For one, as much as the simple graphics did help with visual clarity, and you weren't a slouch with the expressive animation for the player, the game did nevertheless have a rather dry, sterile, and crude look to it overall that got a bit repetitive, especially since it doesn't change up significantly the entire playthrough. There were some physics glitches here and there as well, such as how jumping from a platform moving down will have you awkwardly feel like gravity is pulling down heavily due to you retaining momentum from the platform (it's ok for upwards, but downwards is weird feeling). Also, I'm not quite sure of the necessity of this whole 'don't stop moving' mechanic or the stamina meter: kind of felt unnecessary and even annoying, especially since some spots, like for patrolling guards, can have you want to stand in place to wait a bit. There are also some obstacles that feel like annoying 'gotchas' that you just have to trial-and-error your way through.
Really though, any negatives I can say about the game are mostly trivial nitpicks compared to how the fun the movement was in this, especially with the great obstacle courses you setup. I'd say this should be put this right beside other cool movement platformers like Gappy's Playground, Fancy Pants Adventures, Pseudoregalia, and so on!