Errrrf, you got the audio placement, it's just, with the drop via drums, it seemed to take a little too long, and seemed to not be subjective to an 8-beat rhythm and had some excess sound, same with the intro part, but you can make it an exception sometimes. About the intro part, I think you could have used it more throughout the song, at least where the drum/percussion-only parts stood alone, so your listener doesn't have to go crazy waiting and listening for a climax. About that, the chorus-ish was a little annoying, I wasn't really hearing music, I see what you tried to do, but it should at least be on scale to your musical parts (The intro), and that doesn't mean they have to be similar in sound, but they should have a similar mood and/or beginning note on them, so that parallelism may take place between the two different parts. It's a hard theory to understand, but I may be able to describe it more in-depth with you personally. Sorry, me being a pianist makes me picky about some music stuff.