Now, I decided to spectate. And after doing so I was met with a very confusing sight: a sole ghost hunter shooting into what seems to be empty air. There seemed to be a blue circle following him around, and the hunter was shooting at the circle. I assume that the circle was the ghost, but I have no idea.
There is no AFK option or something like that, so you are forced to play the game no matter what. There is no tutorial whatsoever, not even a simple GUI with information on the game. Even though you can learn practically everything about the game after playing it for three minutes, I still do not like the absence of any tutorial.
About the gameplay itself: as a ghost hunter you spawn with some laser gun thing, and you are supposed to shoot the ghost. After playing the game I found out that yes: the ghost is marked by a blue circle. At some occasions the ghost obtains a physical form, showing his character. During this time you can shoot the ghost, which rapidly depletes its health, making it constantly emit an OOF sound. When it obtains a physical form or when it becomes invisible it emits an annoying, repetitive high pitched laughing sound, which gets REALLY annoying over time.