I honestly feel this should have more of a boom in it, and that it all got kinda chaotic at 40 second mark. Too much going on at once, if you know what I mean. Regardless I guess this is all opinionated.
I like how it loops and sounds like it can go on forever and you won't even find when it restarts. I do however think that as I said earlier it should've packed more of a punch in it... I think...
Even though it's not a full 5, 4's the next best, right? :) It wasn't bad at all, just wasn't maxed :D