Not sure if you're still looking but he's @kaito_creative on instagram. Although I sent a dm a while ago and he hasn't replied so not much luck there either.
I'm not actually on 'gram yet, but if he hasn't got back to you yet I doubt I'd be able to get hold of him before the deadline 🤔 Ah well. I've already made a game based on his work, but if permissions become an issue, I've a heck of a backup entry in the works... 😎