Rolling over the obstacles, jumping up and down with Slendy on your back.
When someone mentions you Slender-man, you know this is going to be about playing hide-and-seek alone in a dark forest against tall humanoid monster. Having Slender in a game title certainly brings attention, but don't expect too much.
First of all this game has been made in stencyl, and as far as I know, this is game building platform, free for flash games. Usually game builders are optimized to output some templated game as fast as possible, without coding, but making a good game takes more than that. Stencyl is good, but it doesn't do miracles. Yet this game is nice example of what you can accomplish if you put some time and effort in making your own game like this. Secondly, despite good intro, excellent music theme and super-popular Slender character promised in the title, in the end, this is just and endless runner. Speaking of optimization, I've noticed that the size of the game file is unduly large (approx 10MB). Imagine what would it be if the game was far more complex than this simple one screen side-scroller.
Your main character, which is some frightened boy lost in the woods, is running endlessly, jumping and double jumping (rolling) over the obstacles trying to make his way out of this nightmare. Nothing scary about that, really. Slender in this game is nothing more than a silhouette displayed in the left part of the screen, practically doing nothing. The game is trying to be fair by giving you more than one attempt, which is not going to be enough to let you live, since all this is just about getting a better score, better than the last one. Anyway, the scores from each attempt sum up, and after several tryouts I was always somewhere in 100ish range.
For some strange reason, I've noticed that Slendy is showing up only every other time. Not saying that I miss him or does it make any difference, it's just that it's kinda odd. If endless runners are your thing, your will probably enjoy this game, mostly because its atmosphere and the way it's getting harder over time. All in all, the gameplay sucks, but as far as the music and the atmosphere goes, I give credit to developers for doing a nice job here.