Hi there, wasn't expecting a question like this 🤔 Glad you like the character design 👍
I'm going to say yes; just be sure to include a credit within the game, plus a link to my itch page on Dicky 4's page when it's done - something like "Featuring Morag created by Grave Reaper Cushions".
I'm looking at your other games at the moment; do you know how to get GB Studio games running in browser? It'll help make them more visible in search results, and they can run on mobile devices too. Worth looking into 👍
(Also, just a little thing, but with .gb files being as tiny as they are, I personally wouldn't bother zipping them before uploading them)