"Oh Remmy" is good and not self-serving at all - this is your creation, and it puts it more into the realms of homage/parody too. So I'd say go for it.
Thank you for the vote of confidence :) I decided to go with “Go Mummy!” after much discussion with my kids and partner :)
It made more sense with respect to the story I’ve created for the game, whereas Oh Remmy would need something new and I wasn’t sure what it would be. But at least that final bit is in place now, and it’s a week of play testing to hammer out any last minute bugs!