I do not need to mention to publish a user manual, as you already did that in your fist post :D.
I have a big problem. Ubge does not show any textures and everything is black and white (not just your game). I wanted to open your blend with bge 2.78a but … Blender crashe when opening the blend file. I guess it is not compatible anymore.
Unfortunately these issues prevent me from judging your game :(.
As you said you assume your game works with BGE too, can you post a blend file that was saved with one of the Blender version? Maybe I can open that.