Ending was good, but not unexpected Overall, I liked the series very much. However, there were also weak points.
What was good:
Lots of movie quotes from movies like Aliens (kid in sideboard, waking up scene) Matrix (2 shots, two pills) and Titanic (lots).
The name Prometheus, who brought fire to humans but was trapped in a time loop
Kerberos, Cerberus, the dog that guards the dead
In 1899 Freud published his book Interpretation of Dreams
What was bad
Many actors had permanently dirty faces even though they were on a ship, perhaps this was also meant to indicate the dream; The mate had large non-healing wounds on his face every day
Many stories and scenes led nowhere, were just facades
Titanic had three schooners and a dummy, that would have been good here too
The spaceship was bad CGI, but it was important and only a short scene.
The resolution was good, but you had the idea for a while that it was going in that direction. Some things were repeated from Dark, like the tunnels or the father, who strongly reminds of Jonas from Dark. Still a lot of potential for season 2, but no material for more than a miniseries. From my point of view too close to Dark, the rest came from Matrix. I would have liked something completely new. The writers don't seem to know more than one story.