I was wondering if it would be possible to use structured temporal dithering to fake more than 16 colors, and it is indeed possible!
at 60hz, 1:2 mixes look fairly natural, but 1:4 mixes are a little too noisy.
An approach to dither the colors of the HSL colorspace with the 16 built-in colors. I settled for a randomized dither. You can download the source by clicking on the icon & saving the png.
This is kind of a parody of old amiga cracktros from a parallel universe, where duangle is a demoscene group, and so are all the people in the greetings!
1.1: added new greetings
This is my first cartridge, a tiny self-running intro with music that does a dithered sinus effect. This started as a fullscreen effect but I had to reduce the amount of pixels to fit the CPU limit.