Honestly, it looks like someone made there own game with Mugen. Ive seen most of those characters on mugen from back before I dropped it. The pink snake thing, the girl that looks like shes from the ring, the midget Manny Calvera with the knife, etc. They were all on Mugen Infantry. This mainly looks like a custom mugen project (Ala Infinity Mugen)
So to sum it up, unless the mugenites stole this guys work before he released it, then......