A few weeks ago I published a Unity3D game across all the platforms just to have the experience of publishing something. Running With Scissors was originally going to be a flappy jam game, but I decided to go in a slightly different direction with it and I think it turned out pretty well. I also wanted to try putting Google AdMob ads in the game across all the platforms just to see if I could and it wasn't that much of a hassle.
I also wrote up a postmortem of the entire process here
if you're curious about the gotchas that aren't documented when doing Unity3D mobile across all 3. Of course if you're on Android or Windows Phone, you can find those versions on the Running With Scissors itch.io page here