Dude, if you want to build up to 3 minutes 30 or something you need a MASSIVE drop. Needless to say I thought the structure was a bit crazy and the bass was on holiday.
Keep at it. The piece at 2:43 was quite nice. Bring it back to 1 min, maybe don't stretch the build-up so long and add a big sub or nasty bass on the drop. Vary the drums.
Just some thoughts.