Fun little game! One little nitpick that I had personally is that I have a habit of holding down jump buttons pretty much until I land. In this game that really threw me off because it only seems to check if jump is held down and not if jump was just pressed, so I would often land from a jump and instantly jump again when I didn't want to.
Cool to see a PICO-8 game here though! I haven't used it before (I'm all Unity most of the time) but it seems fun to use.