Needs more variety
In this song it sounds like you're just adding new layers that repeat over and over for three minutes and twenty one seconds. Doesn't make for a very interesting song at all. I'd recommend going through and adding more variety (within the parts). Change rhythms, change instrumentation, change meter or tempo... heck change the volume of certain parts. Add in different audio FX (reverb, chorus, delay) then take it away. Just letting it sit there can really get annoying. I'm all for percussion-only pieces but a certain degree of depth and variety is needed.