Recently I've been trying to overlay several gfx layers in different ways to get something useful.
Well, this is what you get when you combine layers using OR binary operator... bitplanes!!!
This small Pico-8 tweetcart280 (278 chars in code editor without comments) is my homage/demake of Spike Dislike by Jayenkai. You can find the original one and lots of other games he has made here: agameaweek.com
I'm new to Pico-8. I've been learning from the great carts very talented ppl publish here at Pico-8 BBS. I've just seen a demo doing pretty colorful spirals and wanted to test myself doing something similar in a per pixel color fashion.
The code is a pretty slow unoptimized version without look up tables or palette reordering, but, hey, it works!
Use left/right/up/down to tweak parameters.