Polish in games often comes from subtle, almost petty tweaks to design. Here for example is a recent tweak to the interior “side archway/door” graphics. A number of people have had trouble noticing the current doors, on the left; realizing that they’re an archway to walk through, rather than some odd decoration on the wall tiles. So we threw on a light-stream coming through it, to give it some additional contrast with the regular wall tiles.
These sort of ‘snags’ add up, and can make a game difficult or obtuse to understand; often enough to outright drive people away from playing your game. Unfortunately, I don’t have a more elegant strategy, besides ‘dead reckoning/intuition’ for preemptively identifying these kind of things – the ones that will be difficult for many people to understand at first glance. I welcome any thoughts/strategies in the comments. (besides the obvious ‘testing it on other people’)