Illusion: Ghost Killer

This game was made by Brazilians, congratulations Brazilians. e_e
It's a Slender but with Jeff, nothing really surprising, but a cool game...

This game is like : Walking happy... JUMPSCARE MODAFACKAAAR

Hmm.. So I just clicked the ModdB page and someone on the comments said "Jeff is back guys" so I was wondering, is there a first original game or a prequel of this? Because I want to try this but I hate playing the sequel or based games first.