As far as anything is known about PS Move Heroes, there isn't anything known about it due to how non-existent the ripping scene is for it. However, I do think that Nihilistic Software's in-house game engine—NOD—may have been used as Move Heroes' game engine as Nihilistic's first two PS3 titles—Conan and Zombie Apocalypse—are very identical in structure and files. Although for what it's worth, there was an SDK that had managed to leak online but it's for their very first game, Vampire: The Masquerade - Redemption. Alongside that, there's also this research paper on the engine as it was during the development of their unofficial second game, Starcraft.

Other than those, that's all I've managed to dig up on the subject. Samples from all three of Nihilistic's PS3 titles, including Move Heroes, can be found here and here. For the moment, it seems like the only way it would be possible to do any sort of ripping for Move Heroes in specific is to do a memory dump either on native hardware or RPCS3 and somehow reverse engineer it until you get something out of it

I briefly looked at this and it looks like the biggest part of that file is compressed with zlib/deflate. Containing textures + meshes.

conan level or_02.nwf contains textures (parameters have to be checked) and meshes: