Very bold of you to make a game with voice recognition mechanics, but I think people without microphones won't be able to enjoy it.
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I don't seem to be the only developer with bold game content :)
But this lack of accessibility is probably why you see it so rarely in gaming. It's not that difficult to set up a (scuffed) voice recognition. Even simple games using your microphone seem to be positively received though (based on my memory). This might also just be bias.