Finished the game. Not the longest, lite on story and and an ending that will be divisive (or disappointing) unless you think about some analysis of the stories meaning which is still very vague.
Essentially a walking sim. With sometimes frustrating puzzles and combat.
BUT
This is it. This was BEAUTIFUL! This is the true Giger aesthetic and motives and landscape we've been waiting for. Loved it just because of the atmosphere and designs. There is influence of other artists and Lovecraft which fits in perfectly. Loved the last third the most. IMO worth the money. Some images from the game will stick with me forever.... Depending on how you go, it takes 2h30min to 8h to finish. It took me 7 with slow and detailed exploration.
Covenant's architecture should've looked like this. We should've gotten this in an Alien movie, explored it more in the comics, had an Alien game with such art and style. Prometheus' clean Derelict style used in Fireteam and A:CM has no comparison to this work of art. It's even better then what little we've seen in Isolation.
I so hope they make a DLC or something, I know that there's little hope for that knowing how long it took them to make such a short game, but I just want more time in this world and to see more locations.