The diminishing jump height, based on your stamina level is an intersting new wrinkle to the puzzle platformer style that has made me completely re-think the way I approach navigating levels. Very simple, but very effective, and very well explored in the levels you've created.
The controls are very responsive, and the cute pixel art visuals suit the style perfectly, especially the chromatic abberation effect at the edges of the screen giving it a nice CRT aesthetic.
The only thing missing, really, is a nice chip tune sound track to complete the pakage!