Have not played this game but these documentaries and Tech CG Workshops makes me want to work in games. The No Clip version gives a good background on how the Studio Guerrilla Games was formed and how they got to make their game.

NoClip Documentary

Loish had a hand in making the design for the main character.

Technical Stuff and the Decima Engine and Sidefx Houdini used

https://sidefx.com/community/horizon-zero-dawn-guerrilla-games/