Px Editor is a pixel art tool that has most of things you need (like animation, layers, and selection tools).
I already accidentally completed the November Challenge because of the marketing I did for my website that resulted in a few purchases and donations on my other products, so I decided to make Px Editor free and just leave donations on. :D
Make sure you read "manual.txt" in the game's files. It explains everything.
I mostly just posted to a few sites and discord servers for Px Editor. Nothing too fancy:
Px Editor got its first donation 9 hours after release and has completed the November Challenge! :D