I am playing Alien Isolation and I'm in the medical bay sort of area, not that far from the beginning but progress has been very slow so I have 5 hours on the clock.
Literally the whole middle 2/3rds of the game are the best bit. You're just about to start that period.
Like hours 5-16 are fucking golden. The opening few hours are very 'CoD'-like. Scripted, moving from scene/set-piece to scene/set-piece. It opens up very quickly after that and stays open for ages.
TL;DR: it gets better. Enjoy!