UPDATE:
Thank you for clarifying.
I see now that your intent was to make the song morph the way you did.
However, I stand by the rest of my feedback.
Original 3 star review:
"The beginning of this feels like what you'd hear if you were in the middle of a dark tunnel at night and you noticed a train heading your way. Given the train-like rhythmic percussion, the feel is pretty spooky. This lasts until around 1:12, where the buildup starts to plateau. At that point, the creepiness starts to give way to danceability.
It's hard to know what you are going for, exactly. I can guess, but I'm curious to hear what you were going for when you made this piece. It would help me be able to give better feedback and a more accurate rating, as well as judge this piece by how well your intent came through rather than merely by my own taste.
That said, my personal opinion is it gets less interesting after the buildup stops building and it becomes more like dance music. I think the song is too long to be able to effectively make use of that time and make the piece sustain a scare-factor. Also, IMO, the ending is underwhelming in the way it peters out. Personally I think having an ending that doesn't resolve and is more ambiguous in mood can be more compelling than slowly reducing the amount of instruments until there's nothing left, as what is done here. That's not to say what you did here was wrong or bad; I'm merely making suggestions.
Also, on the technical side, there are parts of the song where the sound becomes distorted, particularly when the kick drum is present. I suggest changing the volume or messing with compression settings until it doesn't distort.
More info about how I review music here: https://codefreq.newgrounds.com/news/post/1089806"