Solid start. Could concept. I think you will find, however, that those colors have been used in such a way many times before, and perhaps it would be good to pick colors which are a little less expected. Maybe?
I thought of this game instantly upon seeing your logo -- http://www.bigredtoybox.com/articles/simonindex.shtml -- not to say yours is wrong or bad, but perhaps needs a little more work.
Futura Maxi isn't bad, but perhaps you should use something contrasting for the sub?