If you're not on a QWERTY layout there are some alternative keybindings from PICO-8 which may be more comfortable.
Player 1 defaults: Cursors + ZX / NM / CV
The game might also be playable with a controller, although I have not tested whether that works in my browser. I've heard that the PICO-8 webplayer supports gamepads in new versions of Chrome though.
Anyway thanks for playing!