I like the timbre and the main melody, but I don't feel like enough was done with it. Without any dynamics or even progression (aside from a couple other bits popping in for a few measures before leaving just as suddenly) there's really not much here. The clapping sample you used also felt rather out of place.
I don't know if this would really benefit from trying to introduce progression, so my suggestion would be to look at all of the modifications you make to the main loop, pick out your favorites, and then condense them into a 1 minute loop rather than try to stretch it out to four minutes.