One of the scary games in the Slendrina series is called Slendrina Must Die The Cellar. This time, it's up to you to look around a dark cellar full of Slender world horrors.
If you were in the basement, you were too close to the secrets of the Slender Man. There are enemies everywhere, and you can only use a few weapons to stop them. There is also no way to kill someone for good. You can only stop them for a while. Try not to stay still for too long, move around as much as possible, and try not to go into rooms unless you have to. Find the books and lift Slendrina's curse.
To walk, press W, A, S, and D. (press Space to jump, hold Shift to run, and Ctrl to crawl). You can aim with your mouse, click left to fire, and click right to turn on your weapon sights. The scroll wheel lets you change guns. Press R to reload, F to use an item, and C to get out of cover while lying down.
Have fun and good luck!