He's been working on this project mostly alone for only a few months, how can you possibly expect the tooling to be on par with anything else.

There's a reason it's not released.

And it's great that you can just pick up an engine, but someone's gotta write that engine, and there's a reason triple a studios aren't using unity for major releases; you'll never get quite as good performance out of a general purpose engine as you would from a custom one.