Wasn't really scared until the first enemy popped out. I was even expecting it after the door puzzle but it still managed to spook me. Great job!
Though the end bit was significantly less sinister, but still very surprising in how abrupt it was.
Took a while, but I got it eventually. Really good puzzles that aren't TOO hard. Only had one minor bug where I had to wait five minutes to put down the Energy Sphere thing. Actually managed to get two secrets in my first playthrough! 5/5 for being fun and challenging at the same time.
Enjoyed spending about six hours over five days solving the HUGE puzzle on conceptis' homepage. Really might be worth forking over money for more like it, if there are enough.
How many Huge puzzles are there after paying?