Lights Out (itch) (Steven Miller)

Made in 48 hours for Ludum Dare 33: You are the monster.

The gate to the realm of the monsters has opened and the monsters have invaded our world. People fought back, and scientists studied the captured monsters in labs. They managed to close the gate, but it could be reopened. You play as a monster who has escaped, and your mission is to harvest as many souls as possible in order to reopen the gate back to your realm.