We identified 2 types of customers: 1) Hardcore gamers who have already spent hundreds of dollars on steering wheels, which look SPORT and AGGRESSIVE. 2) Casual iPad gamers, who have never touched a gaming wheel in their lives and just want a comfortable experience but in an Apple-like shell - SLEEK and MINIMAL. Here are main questions we need to assume/validate: 1) Will we be able to make it to Apple Stores globally with this design? 2) How many casual iPad gamers wouldn’t buy it if not Apple enough? 3) How many hardcore gamers wouldn’t buy it if Apple enough, but not sport enough? Main problem with iterating to "more Apple" will be +6 month time to Kickstarter and money doesn't grow on trees :), but at the same time we get only one chance to make a good first impression. Thanks for your time.
Users don't really care if an element in the game looks more "Apple" but Apple cares. If you make a fun game users will play the game and tell them friends about it. If you incorporate features that Apple wants showcased and graphically build the game to fit in with iOS7 you have a better chance to get featured by Apple which will get your game more visible.
You need to decide which features you are implementing for the user and what you are implementing for the OEM. Also, Apple will care more about your game if you incorporate and Apple iOS feature more than the design and look.