Mild spoilers in the review, censored by the tag:
Story/lore
Signalis is a game that makes you explore the back story of the characters and the universe throughout the whole game. Don't expect information to be handed to you on a silver platter.

Not knowing what is really happening is a really nice touch for when you play the game for the first time, or even the second time... I am very late to the party, but if you lookup the story explanation on youtube or any other platform, you can see that plenty of people talk/ed about it.

One of the things that makes this game really good, is how it conveys meaning to empty words that you get introduced to in the beginning.
Not only it makes you think about how the people of the nation are being fed information through propaganda, but also how the people perceive it in the end.

I fell in love with the lore right when I finished my first playthrough. There are several endings that you can achieve by playing differently, which makes it more fun to just try and think about how you could play to make it to the other ending.

Gameplay
For starters; it tells you information in the form of documents. If you care about the survival-horror game play only, then I'd advise you to reconsider your choice of a title to play. The information is the key to this game making sense.

It's safe to say that I don't play many survival-horror games, since I am not a fan of horror (games).

One thing about the look of this game, which surprised me, is the use of 3D models that are converted to 2D look through pixelation of the environment in the isometric view.
I suppose it makes sense to do this, since you have to animate the 3D model instead of animating pixels. (don't quote me on this since I don't really know anything about this) The transition between the isometric and first-person PoV is smooth, it's not interrupting to the flow.

Afterword
I'd say this game deserved all it's praise. As an indie game, it's peak and I'd buy it again. (In fact I did buy it on Switch...)

Note: I am very late to the party, but in my defence, I got pulled into this game by the artworks :>