Also check out https://github.com/kothic/kothic-js, an older but similar attempt at making a full-fledged map renderer using 2D Canvas. It has a pretty good label rendering in particular which you might find useful.
I am super excited about the parent tool, but unsure whether/when I can generate these bundles programmatically. I tried the web based tool and it works great, but what if I need to do it many, many times?
Can your tool do this easily? Is there a way to generate tiles (tiles.pmtiles) that are imported in the same way?
If I had stumbled on your project, I would not have been enthusiastic about it with just the writeup as-is. Seeing the parent project makes me see the possibilities: a completely independent mapping solution, free of any server/service tie in and additional costs. That is super exciting, and I would love to know if and how your project compares.