i really liked this one!
however, it was pretty annoying to select specific tiles, i'd suggest it wait a little before starting to move the camera quickly
also you could add some more effects, like particles when you jump or collect a bomb or die or whatever (although idk if pico-8 has a particle system)
also i sometimes found myself pressing x when i die and immediately starting the next game, so i can't see my high score - you could make it so i have to wait a few seconds to reset
other than that, and adding more content ofc, it's pretty cool!