This is super cool! I love pixel art so much. I typically use Aseprite when I'm just making stuff for myself, but I really like the prompts and constraints of this. It's very cool to see other people's approaches to the prompts as well. One bit of feedback, I think it'd be nice to have a hover state over each pixel as the cursor move over them to give a bit more feedback to the user on where they're about to draw. Even something simple like an outline on the box you're hovering on.
