Ahoy, if you're encountering problems with the controls, try to Shift+Alt to switch from QWERTY to AZERTY.
I also think there's some tweaks needed with some numbers, HP, DMG even the wave's timer. I can imagine that the controls are not helping at all espescially if you miss the W and A button (I guess since it's ZQSD on AZERTY).
Thank you a lot for your feedback, I've used some free assets from Itch.io and made the character/ui myself + recolor/modify some assets!