I have to say I played the first game (the 8 pages) and liked very much how you put Slender in 2D. Then you updated it and added extras which was cool. Now you give the players the chance to kill Slenderman which is EVEN BETTER. Totally awesome game, many may say the graphics are not flashy but for me it is the gameplay and the feel of the game that are important. And Slender 2D: Kill Slender is very good with these.
I really enjoy the background music, it adds a lot to the atmosphere and I'd like to know where exactly the music and effects are from, or where I can find similar music(yes, I saw Amnesia and others are listed but it doesn't say which track or any other specific information).
And now some hints for players:
1.Sometimes Slenderman can avoid your gunshots(which is annoying if you want to kill him with exactly 8 bullets). Aim for his head-he doesn't seem to avoid headshots.
2.After you shoot him 2-4 times, Slenderman will start appearing more often and dangerously close. I recommend you ambush him or you may just run into him while walking around which means that...well, you'll die.
3.To ambush Slenderman you stay in one place and aim your flashlight towards one end of the screen. If you shot him 2 or more times already you'll start seeing distortion lines soon. That means he's close. Most likely right behind you. Just walk 2-3 steps towards where you aim your flashlight and turn around. You'll see Slenderman standing close and you're good to shoot.
4.I really like what happens after the 7th shot(won't spoil the surprise here). When that happens you're pretty screwed, so my advice is to be around the place where you start the game so you will need to travel a lot less to find what you need to find. And walk slowly-at that point you're an easy victim and Slenderman enjoys jumping right in front of you.