Well that was interesting. If I were to suggest anything it would be to clear up the reverb on the voice starting at 3:00. I think you can still have that giant ambient sound you seem to be seeking but clearer and cleaner. Other than that its kinda "Art" so there are no rules

I think Davedog is correct about cleaning up the reverb. The best way of getting a ton of reverb without it turning your mix into mud that I have found is to layer effects. I would send the vocal to an aux with a delay I would put a bit of modulation (like a chorus) on the delay and then add reverb to the delay instead of the original vocal. This way you get the benefit of the direct sound of the vocal and an "F/X" track that is pushed back in the mix but can be VERY wet. I hope that helps. I've been doing this technique for years. The new CLA plugin from waves does a similar thing.