I've just started learning Unity3D, but I thought I would show my progress as I
Star Shot Unity
As I always tend to do when learning a new game engine on my own, I do so by creating a variation on a game I've always called "Star Shot". You can see my first version of this game on my Game Boy Advance home-brew page. The second version I wrote for the iPhone several years ago, and eventually morphed into a published game called "Nova Rift: Arena".
Now I'm starting on a new version built in Unity3D. Its not a game yet, and it will likely never be a polished thing... it is just a testbed for learning Unity. So far, what you see here (as of 10/2/2014) was built over about 10 hours across a several evenings, including first walking through a Unity tutorial.
The controls are simple... LEFT/RIGHT arrow keys spin the ship, DOWN arrow provides thrust, and Z (or MOUSE-LEFT) fire bullets.
Note that you may have to zoom out in your web browser a bit... the game is set to draw at 1024x1024 pixels, but the browsers always seem to display it huge.