Hi, I apologize for replying a bit late but if the position is still able I would love to join your passion project as your pixel artist and I don't believe Godot will be an issue to my knowledge.
Yeah, it’s still open if you’re interested. You can join the Discord Here which will be used for communication. The GitHub repository for the project is also here. I’m starting September 9th, let me know if you have any questions.
I don’t think the difference between Unity and Godot is a problem for an artist, but Godot accepts PNG images best though.