It needs to be an arousing game first and foremost, then adjusted to a Parody.
Also, a parody needs to look as close as possible to the source material. Amity Park is a good example. Early on it seemed like a great parody game because it resembled the original show. Then they changed the style and, even though the art was objectively better, it flopped because it looked like a cheap Anime rip-off. The original creator is now trying to go back closer to the original style while most of the rest of the team is starting their new game with the inaccurate characters.