One of my absolute favorites so far! Great execution in all areas: graphic, sound, platforming and level design. I love how your idea turns a simple Super Mario clone into a challenging puzzle, that does not only require skill, but thoughtful execution and a clever idea in the first place. My only minor issue with the game is the respawn time: given how often you might fail in a level, it just takes to long to get back into action! Please turn this into a full fledged game - I would buy it in an instance!
My game: https://njamster.itch.io/wonkey (playable in browser, not mobile friendly)