Press WASD or Arrow Keys to move around. You can use Q to sprint and use M to access a map of the building. The map is a little fuzzy. I'm trying to work on that.
I got the raycast idea from griffpatch along with the movement script although I made quite a few changes to them. I got the raycast scripts from DKUniverse all except for a few changes. I also took a block from PutneyCat.