This game uses a parser that seems to be keyword based rather than grammar-based. It doesn't use a trained AI model, instead using the author's own custom engine that doesn't scrape internet data. I thought that was a lie since when I typed Overwatch it mentioned it was a Blizzard game, but I checked the github code and the author hand coded quite a few video games with their studio because it's the answer to a question in one of his games.
So this is a pretty unique thing. The author previously used this system in his game Thanatophobia.
This game has various background images and a 3d model of a girl wearing a dress. Later on, a young girl in a swimsuit pops up, although you can tell her to go away. The characters generally just perform random animations, usually not connected to the game.
The plot and puzzles are structured a lot like Blue Lacuna. Both games have a core element of key plot details, but they drag them out by making them timed in a sense; Blue Lacuna makes you wait until night, while this game will say 'I'll tell you more about that later', and you have to ask again later. Both games also include a lot of ambient nature stuff you can interact with while waiting for the core plot. Blue Lacuna has the island, while this game has random spots you can visit like monuments or national parks or even the sky. These usually don't contribute to the story, although sometimes they have interesting details. Both games last very long due to these mechanisms, while they could be far shorter without them (which could be a pro or con).
This game includes puzzles in two forms. First, there are random trivia questions. These aren't essential to the game, it's just something that pops up in the 'touristy' areas of the game.
Second, there are clues in the form of cryptograms. You click on a letter then type something to replace it with. It's actually a really nice system for cryptograms, lots more fun than doing it with paper because it allows for quick exploration. I usually deeply dislike cryptograms in games but this was fun.
Overall, I had fun for the first few hours typing 'in character', but for the last hour or so I just typed random junk to get through, like 'yes', 'i see', or even just every letter of the alphabet, although sometimes I commented more.
I didn't really enjoy the child-looking girls in skimpy outfits; especially when a romance option was available. The game even discusses the three forms of love (philos/eros/agape) but kind of picks one for you (I think? I refused at first but then relented later to see if it was story critical, which it seemed like it was).
The actual storyline is pretty good, about a young girl in the late 1800s who had the abilities of a medium, able to consult spirits. I actually really liked this main storyline.
There is a darker reveal later, and it contains some things I'm really uncomfortable with it, specifically (Spoiler - click to show)directly telling the player to kill themself. I know enough people that have (Spoiler - click to show)attempted suicide that I really don't want to see this kind of stuff in games; I think it can be handled in a sensitive way, but this isn't it (from my point of view).
Overall I was very impressed with this game, and thought about giving 4 stars. But I think the interactivity could use some tuning in regards to main plot vs side action. The types of characters I didn't care for but are normal for some types of VN games. And the content in the dark area was a little too dark for me. Technically, this game is very impressive, and I had fun with much of it.