A playground for tuning effects and mechanics. Every one has sliders — everything can be changed while it runs.
Reynolds' flocking algorithm — separation, alignment, cohesion. The mouse can hunt the school or scare it. Neighbour grid instead of comparing everyone with everyone.
Strikes into cubes, one at a time or in a volley. Double-peak flicker, three-layer bolt, a shake that decays faster than the light, and fire that keeps burning.