Pretty fun, if generic FPS, though I personally wouldn't call it quite horror yet, just literally dark.
The controls are initially a bit confusing, R to start reload mode, RMB to insert, R to finish reload mode, RMB to rack, then R to start reloading again because you need to put one last shell in.
Also, just a lil QOL, but the player needs to load all shells again at every level start.
4/5, it's pretty good but flawed (in much more than controls, just don't have a good memory), and the only horror was from the initial reveal of the crawler (which is good, but not maintained, I shat my pants at the final fight because of difficulty and not because of individual scariness).