Great work. I enjoyed the last episode very much.
I agree with not going 3D as it is so much more complex from a code and asset creation point of view. As I see it you choose the best engine for the job and for me that's creating 2D games quickly once to work on multiple platforms for a reasonable cost. If I wanted 3D then I would use Unity, but I wouldn't use Unity for 2D as its like using a sledgehammer to nail a picture to the wall.
It's interesting to hear about thoughts regarding C3. The only thing I would say though is make sure you time it well. As soon as iOS8+ is the largest platform things will become a lot simpler in terms of publishing to mobile devices, and therefore HTML5 will be a much more plausible route for many other developers. So make sure you have all the major things in place that they need when they come knocking. i.e. Ads, IAP, Facebook(Post, Leaderboards, Achievements, invites) Twitter(post), GameCenter(Leaderboards,Achievements), Google Play Game Services(Leaderboards,Achievements), Analytics, Push Notifications... basically the same features as the big mobile games. The game creation part of C2 has been really well done in my opinion, so once you have that other fluff you can put dev in neutral.
Perhaps for 200 you could host a C2 Christmas party?