Nice. The five-tile paint cursor is an excellent design choice, much easier than the single-tile default you get on apps like Golly etc.

What’s the Hypermedia reference? On mobile your About button is unclickable.

App is written in Stario + datastar (realtime hypermedia) Fairly cool poc of what’s possible and extreamly simple

Just Explaining the controls - you probably figured it out already :P