Well you've proved you can do the racing game very well, if you can do a mix of the racing/platforming i personally think youre onto a winner ! Also like i say PM that dev to ask about those games Surely it wouldnt be much work to get them working fine for ios7 ?!
Not really interested in using anyone else's IP right now... I have a list of like five games I want to release this/next year. Lol.
Couple of racers, a vector graphic shooter with puzzle elements and an open world mission based game that I want to keep quiet at the mo. Oh, an adventure game, too.
Have you got a twitter account ? Would like to follow if you have and read about updates etc or when games are out