Watching this video, it doesn't seem very much more than a demo for a rather anonymous-looking little touchscreen device, a PMP prototype maybe. Then you find out that the whole thing is running an 8-bit processor with 4KB of RAM. Touchscreen tricks like scrolling momentum are implemented perfectly well, and there appears to be little or no lag. Pac-Man runs at 60fps, which is more than I can say for the version on my G1.