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Sounds interesting buddy,
so which program u exactly used?

In my spare time I create some 2D games and use
Gimp to draw and Sprite to animate my characters both are completely free. ✍

I used ibis paint and 8 bit app to create the pixel art

So it's a tool for those pixel things
because Gimp doesn't work and it's very difficult
to create these figures with a complete pixel look using only Gimp. 😣

Try to use 8 bit app. You can download it for free in Google play store but I don't know if apple store have it