Hey Steve, I'm kind of between setups at the moment as the house is being changed around a bit, so I can't be much use on the overall mix. From what I can hear in my limited state, the various rhythms all work well for me. I enjoyed the listen.
The one thing I would suggest is to layer a quiet normal vocal under the falsetto in the chorus - it would just give that part a bit more body I think.
Have you sampled a pingpong ball as part of the rhythm for this tune?