Really a good question.
Imagine you go into the room, there's a bunch of kids. They're popping the eyes out of a plastic dinosaur toy, and replace with a laser pointer. ‘Yeah, looks cool! Warp it in tinfoil, so it looks like robot skin. And replace He-Man with Sheena riding it - she looks hot!’ - ‘Ok, but i’ll paint one of her arms black, the other yellow, so she's properly varied. And i'll hold the hairspray beneath the dino mouth and the lighter, so it looks like spitting fire! Prepare the iPhone - ready to take a photo?' - ‘Yes, looks awesome!’
And you pull out a Van Gogh print and show it to them. ‘Hey kids, can you tell me how to paint this myself?’ The kids stare at the painting. Their jaws drop slowly, their gaze freezes. Clueless and shocked, not even noticing their hands start catching fire. No response.
That's what you've just done :D
I'm joking, a little bit. But whenever i come across this game, i think i know nothing about games. I do not even dare to play it. I'm afraid to conclude all my work on silly games is useless, and i better stop - to work on something meaningful instead. : )
Without playing this quite often, i can not tell how much AI is involved. How much dynamic, interactive fiction there is inside. I know that's something we can not do yet. Even if current AI chatbots became really good and allow deep conversations, that's technology which did not made it into conventional games yet, for good reasons.
I'm even puzzled by the graphics. Some amateurish artstyle, but visual language is strong, and emotional expression is on par if not better than million dollar AAA productions, which only get there using capturing real actors at huge costs. But such capturing tech gives static content, which they can use only in cutscenes and are not even playable.
Probably they modeled a set of key expressions, and the game interpolates them given the parameters of a simulation of emotional state. But no clue.
The technology of the game is so unconventional, it's pretty sure they don't use some off the shelf engine you could download. Maybe i'm fooled, and the game is indeed much more simple than i think. I don't know.
You would need to search for the devoloper(s) and if they gave any materials about the development process. Maybe they gave some talk, or wrote about it in some blog.
However, game development is hard. Art is just one aspect of it. There is also the tech side it is primarily based on. Do you have any experience on programming or some scripting at least?
If not, you probably aim much too high.
I would point you towards visual novels. There exist frameworks / engines, which are relatively easy to use. Most known one is probably Ren'Py, using Python as programming language which is easy to learn, and also is frequently used by the machine learning community. Visual novels allow branching stories, where you lay out everything which might happen in form of a tree. As the player makes decisions, he takes one branch or another. Such games exist also without any visuals but just text, so no need to create content requiring it's own skills at mastering related tools from Photoshop up to Blender.
To make a game without former experience, you should start small, with low expectations.
Usually we start with games like Pong or PacMan, and getting there might take you months already. An easy to use engine for that would be GameMaker. Others don't use engines and do all programming on their own. Regardless, you need the ability to express everything in terms of math and logic. If it's a 3D game the math is already quite complex on it's own. Took me years to get this.
In general i think games are not art. Because they have a function. And there's a lot of complexity beneath that function, even if the end result feels simple.
As a musician, you could join a team and care about that. You would get an impression of the development process while contributing yourself, and eventually extend your abilities with time. On sites like this people can offer / request this to form small teams, often on a hobby and non profit basis at first.
But the kind of games they create usually are more about dragons, dinosaurs, guns and swords of course ; )