You can download it by pressing the “Install” button in the Itch client, but pressing the “Launch” button just opens a folder containing the installer.
JamesGecko
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The itch project page has an RSS feed. https://dragonruby.itch.io/dragonruby-gtk/devlog.rss
The project gets mentioned occasionally in the RubyMotion weekly email. https://rubymotionweekly.com/
Also, if you install Dragonruby GTK through the Itch desktop app, it'll automatically install new releases of the toolkit.
Would using $dragon.require with a pure Ruby implementation of a JSON parser work?
The Flappy Dragon sample should give you a pretty good idea of what a game built with the toolkit looks like right now. Seeing a complete little game was what made GTK "click" with me.