Very decent game that managed to accomplish what it wanted: to preserve the gameplay of the original Slender Man while still managing to set it as a mysterious, filled with riddles oddity within a more or less grounded story. A (spiritual?) sequel.
The original and ported level may definitely be easier than the original game but it's now fair gameplay-wise, and so are the new levels. You're definitely forced to have a map ready for the "In the Abyss" level, though. Some of those spawns are undair.