One of the things that really stuck out for me is:
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they say that only make games to have fun and enjoy the process.
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Unity most of the time was enjoyable to them.
So these two things would make me questioned why they switched. It sounds like Unity became unenjoyable but every game has moments that you do not enjoy. Not a single game's development is all sunshine and kittens. So I question why they even switched from something they knew they could release with and had the most experience with to something else if they really want to enjoy the full process. To me, it sounds like they want to enjoy a subset of the process rather than the full process.
So then they switched to Godot which they seemingly jumped into the not LTS version and expected it to not have issues. I'm using Godot 4.1.1 and made the switch from 3.x but in doing so I realized I'd be taking a large stop in production of my actual game to get some of the features that Godot 4.x gives as a trade off. Godot 4.x has features that I can't imagine where I'd be without them. For a 2D game though, Godot 3.x is likely what they should have stuck with. The LTS version is always more stable and that seems to be what they are searching for.
Bevvy, it's not going to be more stable than Godot. It's a very much in development engine, so small I thought it was a game framework. No development goes perfect which seems to be what this person is expecting from their engine.