This may be a bit self-indulgent, but how about adding my character, Ulrich? He's a caracal, which I think is an uncommon species in the fandom (even if the actual animal is a bit of a meme in the mainstream, unfortunately). He's a cute femboy-type character whose aesthetic is warm and cozy, favoriting sweaters and will often wear shorts, skirts, and aprons.
He really loves paws! His game mechanic, if it isn't too hard to program, could be that his cookies are paw-shaped, as I have seen paw-shaped cookies before. This shape will give the balls different physics making them get stuck in places more easily. His special ability could be something, like, "Paw Bap" where he slaps the board with his paw (illustrated by a paw print) and clears that area of balls.
His art could also be different, not the art style itself, but his penis specifically. While humanoid penises are nice, it would be nice to see a character with something more interesting. Since he's a feline, his stages could be: Clothed > Nude with Sheath > Tapered feline penis poking out > Feline penis fully out from sheath and erect > and then, of course, flustered expression with cum. Additionally, while most people I'm sure, including myself, enjoy seeing large penises, I've actually updated Ulrich recently giving him a more appropriately small feline penis. I know some people enjoy seeing the cuter small penises, so this could also be an excuse to include those interested in that (and, may, if they want a small penis but not a feline penis, an option in the gallery to switch him to a human penis, I wouldn't mind that).
This is just a suggestion, of course. Like I said, I know it might seem a bit self-indulgent, but I figured I'd offer my character since you were looking. I can show you a reference of him upon request; I don't want to be presumptuous.