Hey bootzin ! I wrote the "GAME CONTROLS" section at the game page description, sorry if this isn't immediately visible from the "game jam submission" page ! I'll paste it down below for the convenience, hope this helps :)
GAME CONTROLS:
- WASD & Spacebar: movement & jumping.
- Left Mouse Button (click&hold/release): choose your left hand spell.
- Right Mouse Button (click&hold/release): choose your right hand spell.
- Middle Mouse Button (or Shift+Spacebar!): CAST THE JOINED SPELL.
NOTE: Your spell casting will fail if you don't have both left and right spells chosen, which will be indicated by a visual cue and a (broken xD) sound.