So much to do.
Many physical tasks - climbing crawling shooting dodging. (Bring knee pads for the crawling, there is rough ground with dirt and rocks. ) But the physical tasks still had a puzzlyness about them. Very well done.
The set was gorgeous and extensive.
The plot was great and the game contained many hidden references to other sci-fi, Easter eggs that can be found, and multiple different endings depending on your choices/performance.
Searching for anything negative to say at all, and all I can come up with is that you will get dirty , sweaty, and possibly wet. So be prepared.