This was a fun read!
I loved the overall structure of the document - it felt concise and readable, and the diagrams and image references added a lot of clarity and brought the game idea to life. Was some of the art made specifically for this GDD?
I especially appreciated the diagrams for the core loop and controls, they helped me understand them in a jiffy. The appendix of comparison games was also useful.
I liked the details about the basic mechanics, world structure, and core loop - but would have liked to know more about specific parts of the gameplay - what do you use other robots’ parts for? Puzzles? If so, what kind? How exactly does combat work against the spiders, and how do you stealth past them?
The narrative seemed interesting, especially the part where you get the memory chips from old robots to try and piece together the world’s backstory.
About the genre - You’ve defined a genre called ‘Perspective Game’ and given a few examples in the appendix, but I don’t see how this game in particular helps to define that genre. It seems to instead fit closely with the existing Metroidvania genre (as Kirk mentioned) and there isn’t enough fleshing out of the knowledge-gathering part of the game and how it affects the core gameplay, for me to recognize it as a genre of its own.