I  checked the first two minutes and didn"t hear any voices...

I don’t see a reason to review it. I already know never to play your games.

Are you sure you’re a team, or are you one guy who’s automated everyone else away? If not, when do you project you will?

Personally I have my reservations about these technologies, but I will not go into details, since it does not apply and I will focus on answering your question.

The dialogues are too short to be able to draw conclusions, the problem with computer generated voices is the acting, usually the intonations do not convey the correct feeling.

3 or 5 lines of a few words, are too few examples to realize if the performance enriches the dialogues or not. The best thing is that instead of a 4 minute video with only a few seconds of voice, you create a video dedicated solely to voice narration, preferably in different situations.

Currently, what you have doesn't seem bad, but I really wouldn't play it, because starting to hear the voice, then stopping after the second or third word, has always bothered me, you don't know if it's a mistake, if you should read, or if you must listen and in that process, you lose focus on the game and the story.

EDIT:
"We wanted to know what you thought about AI voiceover"
The previous person has given you feedback, and instead of analyzing the actual effect it might have on a target audience, you go on the offensive.

My advice, if you are looking for opinions, you have to learn to read the good and bad opinions and learn from them.

I recommend that you give a read to this thread that talks a bit about how to "filter" the feedback.
https://itch.io/t/2570482/gamedev-tips-for-2023

EDIT2:

It does not matter if the voice is generated by a computer or if it is a real actor, it is best that you always give the option to turn them off.

Personally, I would like the game to indicate if it uses an AI generated voice, but this is a personal opinion, I couldn't tell you if objectively, it is better or worse.

I've listened to the voice from the video and although it does sound good as expected, the intonations are wrong in multiple times. Gives wrong impression to me.

Personally when it comes to voice acting, I could care less if it's from real person or AI, I have no favorite voice actor anyways. If the speeches are carried properly with correct intonations and consistency, I'd give them a pass.

Do you believe AI voiceover is preferable to no voiceover (including the option to disable it)?

If the voiceover is as bad as in this example, I rather disable it and use my imagination instead.

Should the game notify the player that an AI voiceover is being used?

Well, using AI to voice characters in a visual novel is certainly a unique approach! I mean, who needs actual human actors when you can just rely on robots to bring your characters to life? I'm sure it's saved you a ton of money on casting fees.

But seriously, I'm not sure how I feel about it. I mean, it's definitely convenient to have AI do all the talking for you, but I can't help but wonder if it lacks a certain human touch. It's like when you try to have a conversation with Siri or Alexa and they just give you robotic responses. It's kind of...creepy.

But hey, if it works for you and your visual novel, then go for it! Just don't be surprised if players feel like they're interacting with a bunch of automated robots instead of actual characters.

Using AI is fine. It's a tool. And over half the people here bitching about "casting saves" are probably using an engine or some other tool that they didn't write to make their games, so screw that hypocrisy.

But in terms of the actual video, where the sampling begins, the voice is alright, but the delivery is flat. It doesn't carry any urgency. You might be able to screw around with some of the sentence structure and punctuation (i.e. "Can you HEAR what I'm saying?" instead of "Can you hearwhat I'm saying?").

I thought it was pretty good! Sure, there were a couple parts where the intonation didn’t match the scene or the pronunciation was off, but I could tell that each character had their own unique voice. If you hadn’t said it was done by an AI I could just as easily assumed that it was done by a human. 

Personally, I'd prefer to read the text and would not use the feature. However it does add something to the atmosphere, and may indeed make it possible for visually impaired players to enjoy your game, though it's no substitute for a human VA. Some of the lines have suitable delivery by the AI, but that "omg" at 2:14 is... lacking.

The quality of the generated speech is quite impressive, I must admit. It reminds me a little bit of the voices in some anime where the voice actors weren't always native English speakers and it would show in their performances. I've only used a speech synthesizer for the voice of a spacecraft's computer in my games myself, but I could also see uses for AI speech as placeholders for timing purposes, or while the dialogue hasn't been locked down, until the lines can be recorded by real actors.

I personally would have to turn this off in the game, the performances are so wooden, but I'm really surprised how well the voices came out!

I don't think I'll ever be using AI like this, but that's capitalism, I guess! Best of luck with your project. Here's hoping you're able to upgrade to humans in the future.

-E