Silent Asylum is a scary game that doesn't follow the usual rules of the genre. The main character is stuck in a strange parallel world full of scary monsters. But the player doesn't have to run away in fear because they can hurt the enemies.
The goal is to find all 10 keys needed to open the door to the exit. They are hidden all over the place. Make sure to look through all the rooms and hallways.
Move with WASD, crouch with CTRL, crawl with C and jump with Space. Move the mouse cursor to aim, and click the left mouse button to fire. Use the F button to get more weapons and items. Use the scroll wheel to switch between guns. Try to attack from a distance so you don't have to get close to the abominations.
Do whatever you have to in order to stay alive and get out of the evil domain.
Have fun and good luck!