I played it! (v1.3.1)
From watching Youtuber IGP (IGP's vid) and (Markiplier's Vid) Markiplier's experiences , this is STILL exactly the way a game about this creature should be.
No good ending. Atmospheric to the point where you feel there. Absolutely wonderful design. I still love the classic game over screen when he gets to you, as a jump-scare that isn't cheaply played; but in my imagination there could be an animation of... your character looking up (slight smooth forced camera pan), and Sirenhead making a noise to fit the situation, then he slashes at you, then the screen turns 'Game over' then to black, you and your character scream as he beats you to death; all in the span of a few seconds...
...fading out for a few more. Back to the title screen. As sometimes he just stands over you. I got soo fucking into the game it was like real life, and that was dreadful. I try to get into the game whenever possible, and the specific way this game was created makes that super Easy! In short, This game is awesome, the creator is awesome...
This game looks amazing and deserves to be developed much more, and the creator deserves the funds to do so. I'm figuring out how to give this boi 50 bucks to help him out. I am enjoying this a lot! >:)