Web Earth Online

Slender is a horror game for computer, you have to find eight pages without Slenderman killing you.

Mon ami - killing even occurs within the WEO game. Unless you were to go into extreme details on the subject, there really shouldn't be much issue with the simple mention of it. If there are extreme details, then it would be necessary to give a warning in the post at the extreme least, though if it were excessive enough it could be unsuitable. But, besides, there's been pictures people have drawn and shared on the forums here relevant to death.

Slender is only a game. It isn't a violent game at all, simply a horror game intended to scare you a bit. The killing could be implied, but it isn't obvious one bit.

Do a bit of research on the subject.

Oh, ok. Thanks Quagga. I didn't know if the topic was okay.

Well, think of it like this - WEO has killing, and it's still an appropriate topic. ;p Maybe Kenya will still find an excuse for it to be inappropriate, sure. My words and opinions aren't rules or authority. But it still shouldn't be an inappropriate topic because the way the game ends is that you're caught and assumed dead, at least.

Look at a few Let's Plays of Slender. Or better yet, try it yourself. ;D Link to (fan)site HERE or official site HERE. (Please note that most videos of the game may contain cursing from the players.)
Again, it's just a scary game. There is no extreme, traumatizing graphics to it, I promise you. At least not when I last looked... Just don't look behind you. :3