So that statement seems contradictory... let me explain my reasoning.
Immortality is Sam Barlow's next game after Her Story and Telling Lies. The previous title improved on the first's formula, and this time around, there's a similar mechanic to progression.
The game starts you with a simple premise: "What happened to Marissa Marcel"? A promising actress who happened to have all three of the films she worked on never released for different reasons. A cache of footage from her work was found and the player is looking through the footage on a computer program. You're given a selection of clips to begin with but they go away after you click the first.

You can skim through the clips which detail recordings of scenes, rehearsals, and behind the scenes or interview footage from the making of the three films. The way to access more clips is more interactive this time around, you can pause the footage at any time and click any interesting items, scenery or people. You'll then be taken to a different recording at a point where something related to your click is found. From this premise you can slowly watch and understand the plots of all three films and any extras found on the tapes. The footage can be sorted by order in the film or recorded date, allowing for both perspectives to be observed.
I'd like to mention that a gripe I had with Telling Lies is how from a specific keyword search you'd be thrown into a videoclip at the moment said word was heard, and rewinding was annoying and slow. That issue is gone here as the rewind and forwarding features offer a good speed, and there's also an instant jump to the start and end of a clip.

Now, so far everything sound good... then what's the issue. Well, as you go through the footage you may start listening to faint static sounds at certain points during clips, if you rewind during these parts... you'll be met with some hidden footage from a mysterious character, replacing some of the actors seen onscreen. These hidden clips hold the other half of the story this game hides. But there's a fatal flaw with them that specially affects players using a Keyboard and mouse (i'd assume most here on Steam would default to it).
Some of these hidden clips simply jump into playing when you rewind in the right spots, however for some others you'll first see "phantom footage" when you rewind, even at the lowest speed the arrow keys provide. I tested with a controller after first finding out, but you're meant to fiddle with the footage just enough to fully get in focus the "phantom footage", and THEN will that hidden clip actually play.

I had already encountered every clip by the time I found out about this, and I had seen plenty of the "phantom footage" parts, assuming they were only there as a sort of easter egg for somber ambiance. Only when I went to external sources to find out why I was missing stuff did I learn about how to access them. I mentioned KB usage above, and I tested with a controller and its super easy to enter the hidden clips that need rubbing of the footage using them, so KB users end up handicapped by a mechanic that's very badly explained on a tutorial box at the very beginning, when you have no use for it. You have to fiddle quite a lot to enter these secrets.

On top of it there's about 15 even more hidden clips that will appear in random videos depending on the playthrought, the prior secrets are always set. This adds additional grinding to check almost every clip to see if its one of the random ones holding the deeper secret clips, all of these need the scrubbing, so you wont find them by simply rewinding normally. This was incredibly annoying, not to mention almost required to look up how you find these, else you'll probably never see them.

Now I get that it's incredibly likely that most people will go to external sites or YouTube videos on these games to get a proper explanation, but never in the past 2 games from Barlow did I need to actually look up how to finish finding all the important footage, on my own I was able to piece everything together and likely miss a handful of minor clips, this game wasn't quite the same. I'm being very critical because that really hindered the experience for me. Also my game softlocked whenever I triggered the credits sequence, which resulted in it not playing at all and I had to see it on YouTube anyways. Seems like a common issue that never got fixed.

To reiterate my beginning statement, I did enjoy how you move through clips, the actual stories told on them, the cast of characters, and the deep, secret, real story the game tells, which is pretty open and leaves for interpretation even after all the footage is seen. But when the "game" part of the "video game" is not helpful to the player, it can only drive them away. I committed myself to experience everything the game had but part of the experience that I expected was not successfully met. if I really had to rate it I'd give it a 6.5 or 7, but I'm emphasizing the negative rating for the above mentioned.

This was an awesome experience. Not for everyone I'm sure, but to me this was art in a gaming disguise

Very interesting very unique game
very well hidden secrets although its sometimes disturbing
I'd say they all did good work, the production team, actors and actresses also the dev team
welldone 7/10