It probably look a little bit like the Super Nintendo-inspired video game by Doctor Octoroc, the mastermind behind the (sadly not real) Dr. Horrible’s Sing-Along RPG. A Who game would make those über-futuristic Mode 7 graphics work overtime.
https://gizmodo.com/what-if-dr-horribles-sing-along-blog-were-a-nintendo-g-5510774
Hat tip to Sam!