bb is not a game, and it’s not an “application” in the classical sense of the word. It’s a demo, a lot like the scene demos of yesteryear, but pumped through the aa libraries. That, in my mind, makes it more like a digital art project than anything else.
bb only does one thing, although you do have control over some details. Much like aview, you can twiddle with the details and refinements, which may be of interest on particularly slow terminals, or machines with display issues to consider.
But other than that, there’s not much I can say about bb. Watch it through once and you’ve seen everything it will do. It’s an impressive display, but not something that will trap your attention for more than a few minutes. Enjoy it while it lasts. 🙂