Grabbed Pico-8 the other day and started playing around with it. I really like it so far! It's challenging, but it's also fun to figure out how to work around the restrictions :D
Here's one of those old-skool fire effects you used to see a lot in demoscracksintros back in the 80s90s
Doing large loops over tables isn't too speedy, so I had to cut it down to 32x32 to keep the framerate smooth. It could probably be optimised, but I'm not great with that, so if you spot something that could speed it up a bit, let me know!
Controls: updown changes the energy of the fire being spawned at the bottom of the screen