I actually agree with you about the language-stuff. I thought your parent-command was essentially making some kind of performance-based comparison between defold and godot, which is why I mentioned Lua.
Defold seems interesting, but unlike Heaps and Godot it hasn't yet been used for any game I've heard of.
(additionaly I don't really agree that Gdscript is particullary esoteric. It's basically python, with a bunch of very obvious engine-api stuff added on top. Language-wise theres very little to learn there, which is great)
> Defold seems interesting, but unlike Heaps and Godot it hasn't yet been used for any game I've heard of
Is this true really? It appears to have been bought by King (Candy Crush Saga) and used internally (see the Defold about page). So while it may be associated with mobile/casual gaming it was worthy of being purchased and used by an otherwise successful company -- at least along some metrics.
Acquiring anything usually has a period of investigation and inquiry which Defold passed.
Seems at least worthy of consideration next to Heaps and Godot.