Do you know the gamemaker game: Squirrels vs Bears? It's got about the same 3d gameplay as this game and was on Yoyogames Sandbox before that site closed down. I forgot what 3d engine that was used in Gamemaker.
The nightmare 3D engine that Adrien posted to let people make nintendo nightmare style games.
Yeah, that's it. Wonder if the engine is still around?
No because the site is gone. Adrien decided to just upload the entire source for nintendo nightmare instead of the old cut down version. It makes more sense that way.
Apparently there is a Yoyogames Sandbox archive somewhere and you can download any game off of it, including the Nightmare Engine.