One day you open a mysterious book and release the Megagate. The Megagate then steals most of your spells! The only way you can get them back is to destroy the Megagate and it's minions. You start with three spells, lightning, fire and the necroclaw. Each can be upgradged, and have a number of uses.
Lightning can be used to propel yourself upward, and can be charged. It has a larger range than fire. Fire is of limited range, but can be used continuously. It can also be used as a jetpack to propel yourself upward. The necrohand can grab enemies, or be used as a platform or to block enemies.