Controls can be fully customized in the options menu or via the pause screen. Default controls are:
P: Pause
Mouse: Move and shoot
Left Click: Hold to enter focus mode
V: Cast Entropic Sphere
C: Eldritch Glyph (bomb attack, limited uses per level)
Z: Shoot (keyboard mode only)
X: Focus (keyboard mode only)
Arrows: Move (keyboard mode only)
Eisydian Saga