Here are Tezuka’s tips, straight from the guy who produced Super Mario Maker 2 as well as had a hand in so many iconic Nintendo games.
Tezuka’s tips are largely about how to get the creative juices flowing, while Totten’s advice (below) is more focused on a systematic design process.
The tips are fairly detailed for Twitter! Besides working as an Assistant Professor at Kent State University, Totten created a card game about Don Quixote called La Mancha.
Hopefully, these tips will be of help!