Game Center and Google Play Services both work fine in the latest CJS. My game, Hungry Hal, was compiled using CJS 2.1. Leader Boards and Achievements working in iOS using Game Center and Android using Play Services. The game is running great on even iPhone 4s and Samsung S3 phones. CJS works, and it works fast.
Would I like to have layout to layout loading to save on some memory, sure. But part of game design, imo, is working around problem areas. Especially in mobile.
Keep watching. Ludei seems to be working fast (much faster than they used to ) and I think some awesome things are coming.
ludei, wanna pay me to make some video tutorials for all that is CJS+C2? Or teach a live class via stream? .