Move 12: iirc the “fashion” right now is D15. Very minor difference.
Move 20: Odd placement imo. I’d expect a true enclosure of the lower right. Black’s stone at R14 diminishes the value of the hoshi.
Move 30: This is honte, but you could consider a tenuki to the left side. Black’s move there was quite painful for you.
Move 34: From here you seem to lose control of the centre. How about pressuring the bottom side with H4 and G4?
Moves 40 and 44 are quite small.
Move 46: I think it’s fine to just block at R10. This the last reservoir of side points.
Move 60: You can think about a sacrfifice move like O10, which seems a bit better.
Move 68: imo this “wishful sente” move is the game loser, alowing your moyo to be ruined.
I disagree with Kaworu; you did make central points, but couldn’t keep them.