Thanks for your contribution!
Neo actually has initial support for Android, i.e. it compiles and runs. It still needs much more testing and fixing since everything I could do happened in an emulator. It is not production ready in any way.
The Emscripten port was started before 0.4 and was put to sleep because of time constraints on my side.
Btw: I added a contributors file to the repo and the about page: http://www.neo-engine.de/about/