On: So, you want to make a game engine

[floydnoel]

Godot is only a handful of years younger than Unity. Both engines are more than 10 years old and less than 20 years old. Godot was used to ship first-party games (before becoming open-source), which is not something Unity has ever done.

[Raicuparta → floydnoel]

I'm pretty sure that's how Unity started too? Unity versions 1 and 2 were never available to the public

[floydnoel → Raicuparta]

Sorry to say, but that is not accurate. Versions 1.0 (2005) and 2.0 (2007) were both publicly available. Unity was announced at WWDC as a game engine developed for Mac OS X.