Does anyone know who did the spritework for Cave Story Story?

Howdy! Figured this would be the place to go. Simply put, do we know who did the spritework for the Cave Story Story April Fool's joke? Here's the context for those unaware.
I tried emailing Nicalis about it but it's been a month now, and I didn't have the highest expectations that they would get back to me anyways.

 

I remember seeing a video made by the YouTuber "Nerdieo!" Where he talks about the whole rumor, and I remember him saying the twitter name of the artist.
EDIT: Sorry, I confused it for another cancelled cave story remake! I guess nobody really knows.