Most if not all game design methods are universal and not restricted to medium. His first two steps are easy to do in a notebook and the 3rd step is also not di

Most if not all game design methods are universal and not restricted to medium. His first two steps are easy to do in a notebook and the 3rd step is also not difficult to accomplish using Unity, Game Maker, or really any engine like those where pushing out a prototype becomes tedious. However in step 3 where he says "playtest+polish it till I’m sure I can’t improve it" for video games this doesn't mean graphically but mechanically which is very doable.