I know others are taking a look at this game right now, and i dont want to step on their proverbial toes. But, i do reccomend you take a look at the below link, which is a small tutorial i put together. Some of the stuff in there you will already know, but some other things might be useful for you.
Also. If you want any more games taken a look at i have this thread here. Just post up a link, and im always happy to help.