You are the Moon Master!
Moon Master is the video game the Mooninites give Meatwad in Moon Master. It appears to be 4-Bit, and it resembles games for the Atari. Unlike real games, Moon Master is very easy, because it's just a scam to get Meatwad, Shake, & Carl to buy merchandise from the game. Its boss is the Gorgotron, who is an actual creature on the Moon, who kills the Mooninites when they go back there.
Scam[]
The Mooninites used this game for a scam, it's unknown if they created it or not though. They told anyone who beaten level four that they are the Moon Master, and sold the Moon Master a bunch of unnecessary junk.