Hi! We participated to the Global Game Jam this year (too) and the result is a 2D artillery observer game with speech recognition, for Android (Jelly Bean and up).
Here is more about the game: http://louhigames.com/2014/01/28/global-game-jam-2014/
In the game you need to defend the center of the map. You can't shoot and the only way to fight is to *tap* the radio button, and give fire commands. Like "Enemy at alpha one", and then the artillery fires at the target named "alpha one".
Beware, this is a jam game and _can_ contain bugs. A lot of them. For me it has been quite stable, but I haven't been able to test it with many different devices.
If you have an Android phone, it would be really fun to hear what you think of the game.
It's a bit unfinished and simple, and of course it's not the best way to control character with voice commands, but it's a nice experiment. It can be frustrating, but can also feel empowering and add an extra layer of immersion.
Edit: You can also comment on Google+: https://plus.google.com/+ArttuViljakainen