Fair enough, but for that price I'd expect more than a language I like. It's got some interesting features, but like I said many other game engines have similar features with no cost, what's the stand-out reason to make me spend $50 once on it or $98 a year. Is this just being marketed to language enthusiasts?
What makes ruby worth using for a game that makes this worth paying for over any other free, oss or commercial game engine with more flexibility in language and capability?
No offense to ruby programmers but, Ruby's not necessarily the ideal language for game programming even when it comes to scripting languages.
And...if you know ruby well enough to make a game, you could learn one of the many other languages better suited to game dev fairly easily.
You're trying to dig deeper where there's no deeper.
What makes this worth paying for, without considering the technical details (like maybe it's a bit faster for some stuff than Godot or Unity) is just Ruby.
Yes, most programmers are able to learn other languages just fine, but we all have preferences. And people who prefer Ruby usually tend to like Ruby a lot.