Nice design, the brush shapes are pretty. But honestly, this is the kind of application which used to be provided as a demonstration of Turbo Pascal's graphics library in 1990... Multiplying some lines into a greyscale buffer on mouse events was perfectly feasible on a 286 + VGA. Meanwhile in 2010, Flash Player 10 can render 300K 3D particles in software: http://www.unitzeroone.com/labs/alchemyPushingPixels
- much faster to load (especially in Chrome)
- works out of the box in all modern browsers, including iPhone (even though it's slow as hell on the my iPhone 3G).
- doesn't mess up your SEO
Which in my opinion, makes it if not a total Flash-killer, a very viable competitor at least.