Thanks! We used ThreeJS and JavaScript for the engine, and Svelte for the UI.
We started the project with a small team, just myself (concept/code/design), Tiffany Beucher (illustration, character design and concept art), Guillaume Le Roux (modelling, animation and art direction), and production by the NFB.
As the project grew we brought others to help with different parts. You can find the full credits below: