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Check this out, from PlanetDoom.
# New Weapons/Items:
# The Double Barrel Shotgun - Goes Boom.
# The Grabber - Gravity Gun.
# The Artifact - Allows the player to manipulate time by slowing the world down, also increases damage and makes you invincible.
# Environment suits - They will have flashlights mounted on them.
I'm sure you can see there're more than a few similarities.