Our startup is about a game construction platform built entirely on the web. users will be able to create a certain type of game using an editor we supply on our website and download it to a 'game player' on their mobile device, so the site isn't just a HTML with some CSS, it's a serious application. We've got most of the logic behind the scenes already figured out , but we don't have the touch for doing design .. ;-)
"Design is not just what it looks like and feels like. Design is how it works." so yeah as dennisvdvliet pointed out design is very important to your product.