DragonRuby has one of the friendliest, most helpful communities I've found on the internet, let alone the game engine space. The devs are very available on Discord, and actively interact with users new and old alike to give words of encouragement and advice. DR is unopinionated, and gets out of your way when you're making games, providing an easy to understand abstraction layer over the pertinent parts of SDL, and leaving the rest to you. If you love simple game engines without clunky editors, and an ability to go from 0 to 60 quickly, DR is your choice.