I often miss certain information in reviews. Therefore I post it here for people like me, who need it quick and easy.

Playtime: ~26 hrs.
Levels: one big world divided in sectors – big and surreal - non linear
Backtracking between sectors: yes
Secrets: yes
Achievements: no
Unlockables: some
Collectables: no
Replayability: yes, but you can see everything in one playthrough
Sense of wonder: enormous