Yes for the keyboard mapping issue it's a dumb confusion on my part. The game was made on PICO-8, a fantasy console that have 2 buttons, X and O. But those buttons are mapped to Z and X or C and V. For some reason I did reference the PICO-8 button name and not the actual key mapped to the button. My mistake.
Plus, PICO-8 doesn't have a remapping option, which is bad even for me (I sometime use an AZERTY keyboard and I have a weird arrow mapping on my keyboard).
Thank you for playing!