Adding credits in-game is certainly a cool option!
I’ve seen plenty of traditional end-of-the-game credits rolls as well as the occasional start-of-game credits (Elibean Nights comes to mind). Credits as a guide menu thing are neat, too.
One of the things I’ve experimented with in the past is having a dialogue scene at the end of my playable progress, which had artists’ personal portraits listing off the artist’s contributions to the project.
Please do not mind the weird helmet character, I think the character encoding broke.
It’d be neat to see a credits main menu option or something, too.