Well done on making the game!
Art style and Aesthetics were great! You created a very interesting premise with a decent Story, however I do have some issues with it which I will get to later on. From the feeling I got from the small portion of the game; I would add more explorative lore one can find through out the game.
Combat gameplay unfortunately I did not enjoy it; It felt extra, with no game feel or engagement felt. I actually ended up preferring just running past all the zombies to continue the game.
However the biggest disappointment I felt on this game was that there was a very interesting premise that unfortunately was not utilized/taken advantage of; A noise that turns people into Zombies and so the only people unaffected were the deaf ones because they can't hear anything. However... in the game, everyone could talk and understand each other easily, so it defeated the purpose of being Deaf (as one could argue "They have hearing aids" so that they actually could hear the sound and get turned as well). I would also make Sound the main gameplay element of the game. I really believe this would have been better with Stealth Gameplay using sound to your advantage better suited over direct confrontations.
I would suggest looking into Harpies for more inspiration on enemies affecting others with sounds, as well as watching the movie series "A Quiet Place" on how to navigate around enemies with sound sensitivity. I believe with these two, you can really build on this premise that you created and truly create a unique experience!
Keep it up!
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My impression was that they were speaking in a sign language, and that they simply didn’t have the time or resources to animate that. Or they could have used cued speech, although if the game is set in the nineties or later I’d think sign language was more common, especially among younger speakers (cued speech is basically speech with manual hints to make lipreading easier, and nowadays it’s mostly used by older people, such as people who lost their hearing after learning to speak, so it’s easier for them to use fancy lipreading than to learn a new language).
Another way they could communicate, which might be a bit easier to animate, would be writing things for each other to read (but that would mostly be how hearing people could talk to deaf people without having to learn another way to communicate; the deaf people would probably still rely on sign language, or at the very least cued speech, since those are faster than writing).