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You are a ghost.
The crystal in the center of the ruins is under attack.
It's up to you to save it. 

Use every weapon at your disposal—and every weapon is at your disposal.

Haunting weapons is difficult. You'll drop some whenever you're hit.

Controls:
 [WASD] to move
 [Space] to charge a dash and focus your weapons
 [Hold left click} to direct your weapons from afar