I'm not sure what was causing the slowdowns, it was played on an emulator, so could have been something with his computer. In the first video (I posted #2) he had a few issues with slowdowns that he somehow corrected with his computer. Dunno what.
I think the game looks great... its got a very "Lovecraft-ian" feel, which its supposed to. And alot of the game physics were intentionally altered in some places to get the desired effect, like the level with the platforms that move as Mario moves, among others. I think it looks incredibly fun and unique.