Well seeing as the cat-voker image was posted to DA before he posted here does not help him. And the artist is apparently from Russia but cyborg's Steam profile says he's from New York. Very shady indeed.
Here's the OP, and the fact their signature has been removed does not fill me with confidence that the work here is actually yours, cyborg Same goes for the riki weapon all in all it's very shady, you may want to clarify where your concepts are coming from and why you're asking for a revenue share if the work is not yours