Ok, some more progress here - and a somewhat interesting direction design-wise. It's now synced with the background music in several ways. As more custom things get used and I suspect few people actually want to deal with that I have made an exe version available.
WASD moves, mouse aims (a bit strangely, because of the layer scroll rates currently). But you can have a bit of fun and marvel at the visuals. Right click will toggle something as well.
Here are some recent screens as well...
<img src="http://i244.photobucket.com/albums/gg36/some9000/A.png" border="0">
<img src="http://i244.photobucket.com/albums/gg36/some9000/B.png" border="0">
The background is currently composed of 4000 objects, so I'm not sure what the performance would be. With 10240 objects it started to slow down here, so I decided to dial it down, leave more room for the fireworks.
Anyhow, if someone tries it, early feedback would be welcome.