Why not? If you don't have restrictive conditions every tool is ok to be used. Plus C2 helps to test on many device types in little time (ex. with the Preview on LAN function).
(I'm talking as a C2 beginner, so here I could be wrong ) Referencing to so many platforms, the standard html5-jscript publishing mode is a nice & fast way to create and mantain the game. Being very dynamic and having the idea to use physic, you should dedicate time to test mobile performances (caring a lot to the mobile web browser used).
I think you should create one simple level for the mobile device you want to test to understand if the game looks cool (in terms of performance and use). Or you can create a complex one to see how it behaves in critical conditions
If every planet defines the levels solving mode as I understood, the time needed should be:
7 worlds (or solving modes) * 25 levels to create and test on the platform * platforms to test;
bye