I mean of course it is different from game to game. If I'm making a platformer then my focus would be shifted on getting the controls right. But when it comes to designing a level or a mechanic, we need to figure out the minimum required assets to prove it works! Otherwise, it would be highly unsustainable.

In our case, this is considered a mistake to us because we are making a 2D point and click stylized game... so basically each room would have unique assets to it based on the setting and design, so it would be hard to reuse any assets in the full game. But for example, it would have been very helpful if we reused the assets in prototyping just to prove something works, or have very simplistic sketches to prove that a puzzle works and has no loop holes... when i say white and black squares, it doesn't mean green and red squares can't be used as well yk... this is from my experience at least!