Some fairly simple particle fireworks just for fun.
Press X to switch the screen effect on/off. For more about that see here: https://www.lexaloffle.com/bbs/?tid=41149
Every sixth of a second, 50-100 Particles are emitted at a random point on the screen with random angle/velocity determined by a tiny bit of trig. They're given colours in the top half of the PICO-8 palette (7+) and as the particles get old the colour changes according to the same mapping that the screen fade effect uses to a darker colour.
If they run out of life or become black then the particles are deleted.
There are two possible update functions for each particle - one with a wiggle :)
-- update: tidied code a bit, updated fade effect.
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