This game is decent but I have some critiques.
The controls for the game are conveyed pretty poorly in the tutorial. Forcing the player to use left click to shoot the gun and having gun direction tied to WASD rather than mouse direction is an odd design choice. The player already is forced to use the mouse so you might as well allow the player to do something with it instead of forcing the player to both move with WASD and also aim the gun at the same time.
The ghost mechanic is interesting but I think it's not designed correctly. There are several areas in the game where you are encouraged to use the ghost because the path is just extremely dangerous and you can't get through without the ghost. This makes me just sit there and wait for the ghost to come back.