"A" and "D" to move. "S" to summon magic. Arrow keys to move magic. Three types of balls. 1 hurts you/red. 2 gives you health/green. 3 gives you magic energy/blue.
Survive the night, which lasts for 200 seconds. After that, you're safe in the daytime. If you choose to use your magical powers. They serve for 30 seconds.