Thanks for sharing your experiences with the engine. I know what you mean by the ecosystem doesn't feel quite like Ruby—you can't pull in gems from RubyGems.org (but there is a dependency tool called Smaug) and it's not as focused on OO as most Ruby is. But after I spent my first few weeks making games with it, I came to realize lack of a huge dependency tree is a benefit. The engine doesn't have strong opinions on how you code your games, but it gives the tools to do so in a more functional mindset than most Ruby code. The API is data-driven, meaning you can work with just hashes or arrays and methods and get really far with your projects. You can abstract away into classes and modules if you need to.

I'm actively working on an interactive showcase of the samples and open source DragonRuby games here: https://dragonridersunite.itch.io/dragon-os

You can browse more games made with DRGTK here: https://itch.io/games/made-with-dragonruby-gtk

There's also the official samples page, which includes commercial games shipped to Android, iOS, and Switch: https://dragonruby.org/toolkit/game/samples

I think any type of 2D game is possible to build with the engine. But it's up to the community (and time) to make great games with it.

+ just wanna say I'm glad you dig Godot! There are so many game engines and libraries out there, and what matters most is finding one that fits your needs and style well. Because ultimately, what's most important, is that the game gets made, regardless of tech.