2D is a format, not a limitation.
It does use OpenGL to draw, though.
All that said, you could certainly use the engine for a 3D game!
Chris
If you need models I can make some in blender. For some examples see my work at http://www.youtube.com/tedkarenm2. I even got code that will draw the blender models on android. An example of the code is also on my youtube channel.
ted m
The code for that is here, by the way:
http://code.google.com/p/apps-for-android/source/browse/trunk/HeightMapProfiler
Chris