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

Features

Full Animation & Onion Skinning

Advanced Palette System

Selection, Floodfill, and More

Layers and Opacity

Make sure you read "manual.txt" in the game's files. It explains everything.

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The Marketing

I mostly just posted to a few sites and discord servers for Px Editor. Nothing too fancy:
https://www.reddit.com/r/Python/comments/9wrjup/i_made_a_pixel_art_tool_in_python_pygame_open/
https://www.reddit.com/r/pygame/comments/9wrlmp/i_finished_my_pixel_art_tool_open_source_on_itchio/
https://www.pygame.org/project/3761/5864
https://twitter.com/DaFluffyPotato/status/1062412858917564418

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The November Challenge

Px Editor got its first donation 9 hours after release and has completed the November Challenge! :D