That's a valid criticism - I don't know how it could be fixed.
Maybe more colors could be added? Game balance has been really tricky with this game, as changes play out very differently on mobile devices and "real computers."
That'd be great! We were thinking of doing that for the homepage, but didn't find the time. I'd happily merge it in if someone were to make an AI for Hextris.
The iOS version is essentially just a static website inside of a webview. Since we only use paths to render the shapes, Hextris doesn't require too much space.