I'm relatively new to this genre, but I liked this one a lot.
The aesthetic alone SLAPS, german + japanese + some analog horror + some Lovecraftian concepts = really good idea and very well executed.

The game's visuals are really pleasant to see even though they are doing that PS1/DS thing. Specifically, the lighting system of the game is really good and adds a LOT to the atmosphere.
The gameplay loop is basically getting a key and opening X thing to get another key or something like that, and the loop continues, until the end. Although I don't think this is bad per se - I had some fun - this is pretty much the only thing you'll be doing throughout the entire game. Good thing it's only 10ish hours or so.
You'll also solve some puzzles and do some killing.
The puzzles are nice, most of them are relatively hard (especially if you're not experienced, like me) but most of the time, you'll be able to choose between solving it solo, or using some help that the game itself provides to you through documents and such. It's optional. No handholding if you don't want.
The killing on the other hand fucking sucks ass. Your character is slow and clunky compared to every enemy, and although it is probably intentional, it's STILL considerably frustrating. On top of that, the enemies REVIVE (yes.) so you have to burn them with a super scarce item if you don't want to have to deal with them again. This ended up being an interesting mechanic since you need to decide where to use said item, usually in places where you go all the time (hallways to saverooms, recurrent puzzles, etc)

The story is confusing, I'll have to watch some YT videos to understand it completely, but it's nice to read about the world of the game through diaries or documents.

The final thing that I want to add, is that, again, I am new to this genre. Taking this into consideration, I was not afraid, but wary, apprehensive ALL THE FUCKING TIME. Since you're always low on ammo, health items, and shit, you're afraid of using anything you have, cuz you don't know what comes next. I finished the game without using the nitro or the grenade thing ONCE.
I had some conflicting thoughts, cuz even though I WAS having fun, I was also feeling something that I should not feel while playing a videogame, at least to my notions.
If it was indeed intentional, congratulations to the devs.

The ending could be better, the final area is good but it definitely lacked some final boss or a final section.
I'm not even sure if the game only has one ending. I probably skipped something, but them's the breaks