Just got back from the haxe conference, wwx2014, after having a great time. Plenty of fantastic people to talk to.
Or, you can build it yourself for you preferred platform and explore the source code with:
haxelib install nme haxelib install gm2d haxelib run nme demo gm2d 10-wwx2014 cpp
Edit – must mention that you might need an dev version of haxe to build the demo.