Maybe I can suggest some things at this place, which I would like to see in a next version?
When I thought about more features, I came up with:
- colored motion blur effects
- transparencies with the options to add, subtract, multiply etc. from layers
- tubulences like wind
- attractions and rejections objects or effects
- controlling the settings by MIDI
- animation of the reference point over time
- particles get shadows from other particles
- and may an option, to create looping animations?