Great work as a PWA. Am also currently working on some of my own PWAs and they're quite the challenge sometimes, but once it works it's glorious.

On mobile it's not clear you have to swipe the sidebar, maybe there's something you could work on. Maybe a bar in the bottom or top that displays the colours? Icon Etc?

Accessibility wise, maybe try to get it to work with keyboard, could be fun to explore.

Without javascript it's just a blank screen, of course it's an web app but maybe statically render the colours, so users without JS or when it fails to load can still see the pretty colors.

Progressive web apps are all about progressively enhancing an app, so it would be logical that it would work for the lowest common denominator. No javascript, no connection, no mouse, no keyboard Etc.

Why are the menu and camera, gallery hidden? How does the user know how to open these? It looks nice but If feel like this would make the ux worse.

Most icons are not understood at first, they are almost always metaphors that once learned can be easily recalled.

Feels like a behance comment.

RIP bandwidth.

uuuh? where does it say 360? The page doesn't really explain what this does.

They’re experts in the user experience, not frontend technology.

Implying that they are and aren't.

wtf were they thinking with the magic mouse? Is this how it really works?

Never really looked into vertical-align, mostly just played around with the values until it worked, so this'll help; thanks :D

Why the hell does every swipe cause a loading screen to appear...?