You have to realize that making an app is generally much easier than making a game, so in that regard C2 has all you would need.
On the other hand C2 lacks a a few things you would want for making an app, such as a number of gui forms, etc.
Not that that isn't doable. There are quite a number of libs out there that could possibly be converted for C2 use.
The only thing that would be questionable is security for such an app.