This was pretty cool.

Question though, how did you do the arrow physics?

Controls were a bit iffy but the creepy atmosphere reminded me of these games when I was younger

So, the bolts were basically prefabs with rigidbodies attached to them. They had box colliders (shifted towards the back of the bolt, so that the bolt would 'stick' into the wall) with "is trigger" enabled, and a script would immediately destroy the rigidbody attached to the bolt if anything triggered the trigger (if the bolt hit anything). Then, the shooting script would simply instantiate a new bolt prefab, and assign it a velocity in the direction the player was facing, and Unity's physics took over from there.

There were quite a few tweaks I needed to do to get them working properly though. First, I had to make sure their collisions were between computed as "dynamic" entities instead of in discrete steps, which is the default. Then, I had to up the tick rate of the entire physics system because the things would still fly so darn fast they would warp through the walls. Lastly, I had to script in an "ignore object X for Y milliseconds" feature, so that the bolt would not immediately collide with the player or thing that fired it (especially if the player was running forward while shooting; otherwise you'd often hit yourself).

Interesting gameplay. The mouse look is abit less sensitive and difficult.