Need some help from you guys with this

I had an idea for a school project.

So yeah we have to make a original storyline of something and the genre did not matter.

I came up with an Idea so here it is.

A creature that travels through dimension to get you like fast traveling and his portals are doors so he could get you when you sleep by opening your door and get you.

The basic idea is that this creature makes "Games" for the victims to play a part in if they fail one of these tests they will get killed what also will be shown on the camera.

I haven't really come up with a name for him but It might be something like "The Host" and a name for the youtube channel (It will be a series) Well I don't know either.

If you guys can give any feedback and some ideas because this will not be in the universe where slenderman exists.

I accept any feedback and help with this.