They are Superhuman in speed, due to moving too quickly for security cameras to pick up their movements. It is unknown if this is due to their abilities or their physical strength, but this means it's possible they could be Wall level.
One Night at Flumpty's is a point-and-click survival comedy horror game inspired by Five Nights at Freddy's. A statement by Jonochrome, the creator of the series, says that steel doors are unable to stop the characters. One Night at Flumpty's: Directed by Jonathan. The characters are able to rip off human heads, landing them at Street level at minimum.
Though clearly inspired by Five Nights At Freddy's in gameplay and title, the characters and plot in ONaF are entirely original, having no connection to the FNaF story or characters. One Night at Flumpty's is a point-and-click game developed by Jonochrome.