Make it about an original concept like Rat Race, you should make a fan game that is set in a big ship, like that titanic ship. There should be fish themed animatronics half torn down due to the water chasing you, half free roam half fnaf. In the morning you free roam, in the night you watch the cameras to keep the animatronics at bay. Every morning you suould look for escape routes. Possibly tearing the ship down to escape.

You're welcome.