Tazling, thanks for such wonderful feedback - lots to digest here. Much of what you suggest is already on the backlog and (time permitting) it'll get implemented; more effects, obviously.
The effect triggers are pretty simple at the minute - mostly tempo-triggers keyed off the beat detection, and there's a few effects that directly map frequency regions into triggers too. I'd love to generalise this so other folks could begin creating effects - similar to Milkdrop, I guess, although working in a space rather than a plane is quite different!
I've done a few prototypes of hand and finger trails, and that stuff is on the backlog - it looks great, but needs a little more work before it goes in.
Pop on Discord if you would like to give more feedback!