Don't worry mate, as long as you are able to submit a game you'll have won, it's not the end result what matters, it's the journey and what can you learn about it.
We, for example, are a team of two, but we don't have enough time to produce all the art so for the environments and artwork we're using some free assets and we're making custom characters and enemies, but we don't have any level layout yet.
Cheers