Well, as I have said before, until a game is released that performs well on its intended target platform, C2 will not be taken seriously.
The best dev for such a game is Scirra themselves, they are the ones who know the tool and its potential better than anyone. It is in their interest to publish a cool, well performing game, that not only showcases this awesome engine, but also proves that all the issues with performance\bugs are in fact caused by those (devs) who experience them.
It may well also expose some issues with the engine, that only surface in projects with more than a few sprites and a couple events.
The challenge of course is do Scirra have enough confidence in their own engine to take on such an exercise?