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).
Get it from Google Play https://play.google.com/store/apps/details?id=com.louhigames.ggj2014
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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.
Thanks everyone.
Arttu, Teemu
Edit: You can also comment on Google+: https://plus.google.com/+ArttuViljakainen