Cheers :) Yes, I was definitely inspired by Bloom, I used to listen to it a lot while working.
The original JS version (http://matt-diamond.com/drone.html ) has some control over the parameters, I was going for something a bit more minimal.
About the CPU usage, yes it's doing a lot of processing, or better to say, it's doing a few simple calculations very often. On my machine (Macbook Pro) it tops out at about 55%. Performance is on my todo list as it should be possible to leave it running for long periods without draining your battery. I'm sure there's plenty of room for optimisation.