As a fan of the Slender saga, especially the first game, I have to say that this fan game is really well done, starting with the fantastic graphics. The enemy spawn is really well designed and the map is small but meticulously detailed. I recommend replacing that concrete wall with a fence and leaving fields or mountains in the background (they shouldn't impact performance too much). So what can I say, you deserve five stars, really great work!
If you want, check out my page too. I need some opinions from other creators.
Bye, friend :)