What will the game’s UI be? What are the elements?
What will the UI element do? Is it a non-diegetic, diegetic, meta, and/or spatial UI element and why? Are there any refence points that can be used?
Are there any interface diagrams?
What are the controls for the game? What are primary, secondary, or tertiary controls? Why was this control scheme chosen?
What features are in place to make the game more accessible?