Start work on C3, and go back to targeting the OS, Win\Mac\Linux.
Following on 
Refeuh , 
QuaziGNRLnose and 
Tylermon , I'd like to remind that there is also a heavy, well established concurrence there. I mean, C2 is clearly an impressive tool to develop html5 games. But as far as targeting Desktop platforms (and consoles) is concerned, there are plenty of solid alternatives out there... game maker, unity, clickteam fusion, the unreal engine, to only name a few well-known pieces of software. There's even the open source Godot, which proved to be quite impressive!
Html5 is both a strong bet on the present and the future - don't forget it's a relatively young tech, and it's already pretty reliable!