subjective terms for sound are always hard. :) when i say boxy, i mean it sounds like having a cardboard box over your head. sortof like too much reverb, but with a really close feeling instead of the faraway feeling that too much reverb usually causes. it's probably just a product of the track being so complicated and my poor brain not being able to keep up with all the sounds.
but anyway, it was a minor nitpick. nice work again. :)