Having played all Myst games as well as Obduction, I want to summarize how Firmament holds up, as a puzzle game and also a Cyan Worlds game.

TLDR; Decent puzzle game. A little short and easier compared to mentioned games. Expect a few bugs. Classic, maybe dated visuals. But overall I had a pleasant experience with no complaints.

- Environment -
If you've played any of the mentioned games from Cyan, this will immediately look familiar to you. Beautiful, vast scenery, across multiple worlds. A feeling of loneliness and exploration in a world that was clearly inhabited, but for some reason is abandoned.
I will say, that the game does not have ground breaking graphics that will blow your mind. If anything, it does actually feel like the other Cyan games. I personally didn't dislike the dated visuals as it had a feeling of familiarity and nostalgia for me.

- Puzzles -
The puzzles themselves are pleasantly challenging. Definitely NOT as difficult as any of the Myst games or Obduction. I never had to take any screenshots, and I only had to use my notepad once or twice to test out a solution before I apply it in-game.
The Adjunct is a very welcome addition to the puzzle solving experience, with clear explanations of what you're interacting with, and friendly controls and even a display for some puzzles that you don't have good vision in. You're no longer left to figure out what the puzzles are for, or what their components are. That is not to say it detracts from the experience. There's still a bunch of clever solutions you need to do to progress, as with all Cyan games.

- A Few Important Notes -
Length - Compared to the other mentioned games, Firmament was to me, shorter, and also easier with less obscure puzzles that required me to backtrack.

Jank - Having played through all the Myst games just recently, it wasn't really unexpected to see a few bugs. There are a few that could hinder your progress in various puzzles, as well as other more minor game design bugs. I highly recommend SAVING before you attempt any solving just in case you run into a bug that gets you stuck (I encountered a few instances of such in later puzzles, but nothing too annoying or game breaking)

Performance - I have a pretty old pc, i7 7700k with an RTX 2080 Super, and I set the graphics settings to max, with no super sampling. Even though I did get 45-50 FPS in some very particular spots in the maps, overall I had a very smooth experience, mostly locked at 60FPS.

FINAL NOTE: YOU'RE SUPPOSED TO HEAR A NARRATOR AS YOU EXPLORE THE GAME. IF YOU'RE NOT HEARING THEM, THEIR DIALOG IS PROBABLY STUCK IN A PREVIOUS MAP. I realized this only at the end of the game lol but it didn't really hinder my progress as I still understood what I was doing and why and still finished the game with the important dialogs occurring and understood the story.

Having played all Myst games as well as Obduction, I want to summarize how Firmament holds up, as a puzzle game and also a Cyan Worlds game. TLDR; Decent puzzle game. A little short and easier compared to mentioned games. Expect a few bugs. Classic, maybe dated visuals. But overall I had a pleasant experience with no complaints. - Environment - If you've played any of the mentioned games from Cyan, this will immediately look familiar to you. Beautiful, vast scenery, across multiple worlds. A feeling of loneliness and exploration in a world that was clearly inhabited, but for some reason is abandoned. I will say, that the game does not have ground breaking graphics that will blow your mind. If anything, it does actually feel like the other Cyan games. I personally didn't dislike the dated visuals as it had a feeling of familiarity and nostalgia for me. - Puzzles - The puzzles themselves are pleasantly challenging. Definitely NOT as difficult as any of the Myst games or Obduction. I never had to take any screenshots, and I only had to use my notepad once or twice to test out a solution before I apply it in-game. The Adjunct is a very welcome addition to the puzzle solving experience, with clear explanations of what you're interacting with, and friendly controls and even a display for some puzzles that you don't have good vision in. You're no longer left to figure out what the puzzles are for, or what their components are. That is not to say it detracts from the experience. There's still a bunch of clever solutions you need to do to progress, as with all Cyan games. - A Few Important Notes - Length - Compared to the other mentioned games, Firmament was to me, shorter, and also easier with less obscure puzzles that required me to backtrack. Jank - Having played through all the Myst games just recently, it wasn't really unexpected to see a few bugs. There are a few that could hinder your progress in various puzzles, as well as other more minor game design bugs. I highly recommend SAVING before you attempt any solving just in case you run into a bug that gets you stuck (I encountered a few instances of such in later puzzles, but nothing too annoying or game breaking) Performance - I have a pretty old pc, i7 7700k with an RTX 2080 Super, and I set the graphics settings to max, with no super sampling. Even though I did get 45-50 FPS in some very particular spots in the maps, overall I had a very smooth experience, mostly locked at 60FPS. FINAL NOTE: YOU'RE SUPPOSED TO HEAR A NARRATOR AS YOU EXPLORE THE GAME. IF YOU'RE NOT HEARING THEM, THEIR DIALOG IS PROBABLY STUCK IN A PREVIOUS MAP. I realized this only at the end of the game lol but it didn't really hinder my progress as I still understood what I was doing and why and still finished the game with the important dialogs occurring and understood the story.