I am super late with this reply, but it can not be stressed enough that artsyle is far more important than ‘graphics.’ You referenced Portal, which is an excellent example. I’d cite ARC Stystem Works’ Guilty Gear and Dragonball Fighter Z as equally excellent. They don’t follow the real world intuition principle you mentioned (which I think is a great point) but they put 100% of their ‘graphical’ effort into ensuring that the art style of the subject matter is conveyed consistently and as envisioned.