While the controls feel a bit wayward, I really dig the concept. Both the idea of using the keyboard as a sort of lifebar and character selection (which sadly did not make it into the submission) as well as the the fact that both jumping and stopping are triggered by the same key. Takes quite some practice to get it right, but also makes it way more satisfying than the usual infinite runner, once you get up to speed. :)
My game: https://njamster.itch.io/wonkey (playable in browser, not mobile friendly)