Show HN: A coloring book where your drawings come alive and walks into a world

You pick a drawing, color it in the browser, and when you're done it comes alive in your colors and walks (or swims, or flies) into a world with everyone else's drawings. No account, no install required. You can also print a page, color it with crayons and take a photo, and it reads the colors from the paper and makes your paper coloring come alive!

Nothing is animated by hand. Each drawing is split into parts, and a skeleton for its body type (four legs, bird, fish, two legs, and a few more) is fitted to it. The picture becomes a mesh on that skeleton, so legs bend without seams, feet stay planted when walking, and tails and ears bounce with a bit of spring physics. Your colors go into the mesh's texture. It's built with WebGL2, with a Canvas 2D fallback.

The worlds are shared live: when someone sets a drawing free, it walks in on everyone's screen (though you also have private Friends and Family worlds).

Most of it is free; a few worlds and some creatures are unlocked via an optional pass.

I'd really like feedback on the first minute: is it clear what to do, and does the "it comes alive" moment work? I'll be here all afternoon.