This is the best free pixel art program in the world.
I used it to create a Minetest mod, and I had no problem, what's more, among the other options I had this was the best without a doubt, thanks to the fact that I have it in the itch application it updates itself, it is also made in Godot, my favorite engine, every time I need to make a pixel art I will turn to Pixelorama (Google Translate)