Oh, I think the demo actually worked, but it was a huge hack. Do you want to target iOS?

(mruby games can be published in the App Store, wow :) https://itunes.apple.com/us/app/mobiruby-game/id548210182?mt=8)

I think the biggest task is to wrap all the Gosu APIs like this:

https://github.com/jlnr/mruby_demo_game/blob/master/mrubytest/MRbImage.cpp

...and then these extra C files, along with mruby, could be wrapped up in a CocoaPod. I've created an item in my personal To Do list for this, but I am really, really, really slow right now :) I need to release Gosu 0.8 before I can touch anything else.