Don’t be afraid to challenge your intended audience, but always keep your intended audience in mind when you are making design decisions.
— Chris Renshall, TGIK Games
For a game designer it can be tough, but you have to pull the trigger to ditch a design if it’s not good enough.
— Ben Pinchback (@pinchback21)
Relationships matter. Persistence matters.
— Michael Iachini (@ClayCrucible)

Cardboard Edison's Favorite Tips & Resources - August 2014

The more you design games, the better you get at figuring out what makes a game special. I strongly encourage new designers to design two dissimilar games before pitching any. Creating your second game gives you such a different perspective on the whole process.
— Randy Hoyt (@randyhoyt)
If something doesn’t feel quite right, it probably isn’t, even if you can’t identify what specifically is wrong. Following that intuition is crucial to game development.
— Nat Levan (@OakLeafGames)