what& #39;re some of your favorite personal rules for game-dev?

okay I& #39;ve got a few:

just because you can make a whole thing in 3D, doesn& #39;t mean players have to see every part of it

levels, models, everything. maybe your game is better with a less dynamic camera, or this object doesn& #39;t need seconds to load just so it can rotate in the menu

another:

if the player isn& #39;t enjoying something, why? is that your goal? if so, why? if you can& #39;t answer these questions, you probably need to fix or rethink the thing