It looks like a 2d engine just starting with 3d.
Not so fan of cloud-based multiplatform game engine, I always prefer to have the needed soft on my machine, as possible.
Anyway they are talking about nice features for coming most of them, such as the ability to play game in editor, while making changes in realtime, just-in time compiler, advanced shader effects, bones animation, particles, a georgeous lighting and shadowing system, amoung others, that sound good to me.
Using Haxe for coding, some sort of OOP lang, even navmesh/pathfinding features.
In general it sound promising, the time will tell us the final result, I though.
Anyway, despite some of those features going well for GG, GG should continue their own path, without to same some clone of other existing engine. Just my though.
3com
Laptop: Lenovo - Intel(R) Celeron(R) CPU 1005M @ 1.90GHz
OS: Windows 10 (64) - Ram: 4 gb - Hd: 283 gb - Video card: Intel(R) HD Graphics