Let me start that I agree that I think GameClosure should be supported. I feel that the GC team would be more responsive than Ludie. I feel that Scirra and GC team would have better communication possible being able to get C2 running on mobile better than CocoonJS. Although WebGL is a heavyweight in game design as with the accelerated physics.
As I understand you have only tested with the SpaceBlaster sample put together by Mario? Have you tried putting together your own C2 Games into GameClosure, because I don't think you did.
First Mario spent a fair amount of time to have to wrap up C2 runtime to get C2 to run with GC system. Numerous hacks were done to trick C2Runtime.js to run with GC. This is at least a benefit that some one did it and C2 developers don't need too.
Second Audio is another matter. Audio needs to be pre-loaded by manual code writing. Which is the breaking point for most C2 users.
Third C2 developers need to learn how to use Github in a linux environment. Which includes all sorts learning about ADK, ADT, ANDK, updating these software and persistent export testing.
For most C2 developers this is too much to handle. I can work with it, but I chose C2 to get away from all of that.
However there are some good benefits to using GameClosure over CocoonJS that I wish Ashley would consider having a proper port too.
* game Closure is Open source
This means that if we need some support element we can actually add it. If some one wanted they could write a WebGL canvas.
* Game Closure has a better response than Ludie. Not as good as C2, but better than Ludie.
Honestly it's very frustrating that C2 will adopt Tizen, W8Phone and other small time mobile OS, but still won't support IOS and Android exports. GameClosure is a viable export option that would give an alternative more stable option than Cocoonjs, but is being shot down under the flag of "CocoonJS" is good enough. When it's not. yes it's got the best feature set no arguing, but with terrible updates, breaking features with C2, worst support from the largest group of the 3 mentioned. It's an absurd sick joke that people have so much difficulty with CJS.
In the end though the mentioned hurdles are very large ones and not so easily over come unless Scirra takes the initiative to support GC. GC made the effort by showing how C2 can work with GC and created a js bridge. It's now in Scirra court if they are interested.