You can swap between a Warrior , who uses axe-based physical attacks, and a Wizard , who wields elemental spells.

Scattered throughout the levels, these orbs grant elemental abilities— Fire, Water, Air, and Earth —that strengthen your character's attacks.

Makes it easier to jump back into specific levels.

In this "saga about the everlasting battle between good and evil," you must collect gems and three specific keys on every level to unlock the gate to the next area.