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It's a really impressive project. Also check out the associated scene editor https://github.com/mrDIMAS/rusty-editor

Check out the UI framework that it uses https://github.com/mrDIMAS/rg3d-ui

Agreed, this feature set looks like an incredible amount of work for a year.

Interestingly it seems it started as a shooter game more than an engine — explains why the feature set is tailored towards that.

I agree. Dmitry used to work on tools at Larian (studio behind Divinity: Original Sin) so he had a decent amount of experience.