I've just updated Electrical Rubaroo with 20 medals. My difficulties with adding medals to the game months ago was due to one really annoying line of code I had added while testing. All should be fixed now. Without going too much further into the issue, I can say there was just a dumb variable that made things not want to unlock properly.
The 20 medals all revolve around the main upgrades. If you have any saved data from playing the game previously, all you'll need to do is hit the "Post Scores" button to unlock any medals you're eligible for.
I plan to add medals to any future HTML5/NG API 3.0 games I create. In fact, you can also expect two medals for the trivial trivia games I have already released.
Happy unlocking!
HerbieG
If the game would disconnect from NG simply reload it and buy just one more upgrade in a category with missing medal; that should unlock it.