Hmmm. DragonRuby seems to be a closed source proprietary game engine (at least as far as I can tell). With open source engines like Love2D / Godot / PhaserJS / Pyxel becoming more popular - this may be a deterrent for many devs on HN.
Something else to consider is traction, if you get stuck in DragonRuby there's probably not a huge amount of docs/tutorials around it. That being said, it does seem like they have a pretty active Discord at least.
I totally get it - I'm not definitely not casting aspersions on their choice to go commercial with it. I just feel like with the insane Unity pricing restructuring (which they ultimately rolled back) - a lot of game devs have been pretty gun shy about investing in another proprietary engine.
That said, we can always use more game engines / frameworks!
Something else to consider is traction, if you get stuck in DragonRuby there's probably not a huge amount of docs/tutorials around it. That being said, it does seem like they have a pretty active Discord at least.