Wobblepaint
That's one of these ideas I wish I had come up with. It sounds fun to program, fun to use and even potentially useful to make cutesy gifs.I wasn't familiar with PICO8, it seems to effectively be a faux-retro console emulator that you can use as a sandbox to build programs (that can then be exported to a web player, which is quite nifty): https://en.wikipedia.org/wiki/Pico-8Unfortunately it's a proprietary platform.