Sure sounds creepy

I give it to you, the mood and the pace is perfect. The melody side is strong, but drums could use a bit of more variety both in pattern and in sounding.

I also wondered, whether it's intentional, that the intro sound's panning seems to weigh more on the left? Did you "double wire" that instrument, so that a track plays continuously, and another pans, or is it 1 track with more subtle change?

Nice bass sounds throughout the whole song, and neither instrument seems to eat up the others.

I gave it 7 because of the drums, length and low "replayable" value - on the 3rd listen, it's beginning to get a bit repetitive and predictable, but is fit for a spooky-themed game. Overally, nice work.
Peace

Mysterious

This song reminds me of some ruins that I drawed in a map of the Organ Systems Temple, that the first floor is the Digestive System, the first basement floor is the Circulatory System, the second basement is the Urinary System, the third basement is the Lymphatic System, the fourth basement is the Inmunologic System, the fifth basement is the Nervous System, the sixth basement is the Skeletal System, that is the Human skeleton itself, and finally, the seventh basement is the Thymus itself and at the bottom of the thymus, there is a valve to go down to the eighth basement, where the ruins are located and there's a boss battle in the ruins. The boss is called the Organ Monster, that is made with all the organs of the human body. Make a remix of that please. Keep up the good work.

Awesome very cool feeling to it.

Sorta reminds me of something thats happening during the night... then it gets real sneaky and what not, its ok if you don't know what im talking about, noone really ever does. lol