Left / Right arrow keys to move the character.
Z (long) / X (high) to jump.
1 - 9 to select ability.
Up / Down arrow keys to aim. Space to activate selcted ability.
W / A / S / D to move the camera.
Q / E to switch between units you control.
Left Click the terrain to destroy it, Right Click to add more.
P to toggle fullscreen.

PROTIP: Press P and F11 for the best experience.