Wow, that's a long time! I thought I'd done most of the things in the game and my play time was only about 105 hours! (170 hours in GOG galaxy with reloads after TPKs).
I agree, the game was great. I'll be playing it again soon, although I've got a few others to play through first. Maybe I can forget some little details of the story and get to enjoy them again.
There's still plenty to find in second, third and even fourth playthroughs! Should still be fun, I know I did a bazillion runs back in Early Access and it still took me a while to burn out.