That's very tempting, I think that I remember your videos, although I don't have any concept how to make it a game.
What about making it something like Mysty Mood from Loopix, as a free 'toolset' of environmental effects?

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt