(Text to speech is a form of AI. Again I am not against it since it's not generative AI so it's cool. And I feel like you are doing a lot to dodge the critisism. And also people put "demo" in the title because the full game isn't out. "Eventually" means it's not tommorow or today so like again you made the entire page seem like this game is way way way bigger and more complex than it is. Second of all no idea what engine you are making this game in but seriously it can't be that hard to add a UI script with a public variable to control the volume function that should should be integrated in the game engine.
Also for the love of god I really really hope when you say "my first attempt at creating a videogame" means first public attempt. Cause if the way you are starting gamedev is by making a full game publicly. Moving on I feel like a single person making their first attempt on making a video game is a excuse you can only use if the game has a base level of quality. I don't think the game has enough material for you to use that excuse. Again I don't want to compare you to other devs, Just saying bad response to criticism. And with the "small story" you wrote in the page. Seriously of course lots of demo's put content in the description that isn't part of the game. But your base game is no where near close with what you are conveying through the images and description. Again the base level you need to reach for a game. And finally "If there's something wrong, definitely it shouldn't be from my part".
Seriously did you say "my audio work could be a bit better"?. You might have a broken sound system or a headset if you think it's a little bit.
Listen people who leave reviews in itch io or in youtube reviews in general are really really nice but I am gonna be brutally honest. Your game just not good and rather than taking the criticism (added with the fact that this is your first attempt at a public game) you are just dodging it. You might as well also tell the player to "open visual studio and rewrite the entire game" if they don't like it. Again I am not telling you to delete the game or stop making games. But just realize your game is in all honesty a 4/10. That might be harsh to hear but if you don't accept that your game is bad then you are gonna be stuck in the group of the the greater itch io slop content genre