When making a video game, gameplay and mechanics should always be top priority. But that aside, which is the second most important component to game design? In my opinion, its the games' asthetic and presentation. How you present your game world and mechanics is actually a very important part. Now that you have a rough concept, you need an asthetic cool enough to fit those mechanics. You need an art style to match the tone and world along how the game looks, feels, and sounds. Gameplay is no. 1 of course, but if the asthetic is boring, then playing the game can feel boring as well.
Devil's Third is a good example of a cool concept bogged down by generic presentation. It's basically Teenage Power Fantasy: The Game. That's fine, but you need to actually do something with it. Take No More Heroes, a game not only filled with crass juvenile humor and over-the-top violence, but also slight otaku pandering. It has a style that makes its violent and crude content unique and interesting.
Devil's Third is a good example of a cool concept bogged down by generic presentation. It's basically Teenage Power Fantasy: The Game. That's fine, but you need to actually do something with it. Take No More Heroes, a game not only filled with crass juvenile humor and over-the-top violence, but also slight otaku pandering. It has a style that makes its violent and crude content unique and interesting.