at first i was scared of playing it, since it was called a "horror game" (which im not a big fan of) and i thought it'll contain jumpscares, but fortunately the game was called like that just because of the dark theme/story. completed 2nd, 3rd and 4th ending by myself, but needed the check puzzle solutions and ending file to complete the 1st one. It all took me 1 - 1,5 hour. All of the endings were amazing - *SPOILER* - even tho i was surprised at first because there was no "happy ending" (but that made the game even better). The characters were amazing as well, each of them had a well written personality. Fully recommeding, even for the people who don't like horror games (since it wasn' that scary in my opinion).
Also, there was a bug where the game was just showing black screen when there was suppossed to be a cutscene. it happened to me like 5 times while i was playing. when it was happening, i had to quit the game and start again from the save point.