This is a game I played recently. It's rather short (I won on time after 100 moves), but I chose this one because I didn't like my play at all until move ~70, because I felt like I was behind by a huge amount (mainly because of his gigantic moyo on the right side). As far as I can see I messed up the lower right corner AND the top. It seems to me that if my opponent would have played a bit better (for example something like n14 instead of n15) , he could easily have won and if I hadn't been able to kill one of his groups, It felt like I would lose by a lot.
That's the game (I'm white):

just my thoughts, don't trust all of them!
w12@O2 results in a weaker wall
w30,32: upper side seems more urgent
w40: choose the bigger gap at R14
w42: invitation for a b wall along the top: giving him a big moyo
w64@c5: force him to play d16 to make him overconcentrated
w86: keep on walking to hane later, why not?

Added some comments:

_________________
Tactics yes, Tact no...

Thanks for the comments, like I thought, I messed up the corner pretty badly, I definitely have to learn some joseki / standard sequences

@cyclops: yes, invading at R14 instead of o17 was one of the first things, that came to my mind when rewieving the game by myself, as well. I don't know why I didn't do it in the game.
I didn't keep on pushing the wall, because I wanted to get an attack on (and kill at least parts of) his upper group.

@shapenaji: the comments helped a lot . I thought, for example, E6 was a good move. It felt like a direct cut wouldn't be able to kill either group. E6 aimed at putting more pressure on the left group when I cut. Plus, If he connects I could attack to get strength in the center, so it would be easier to reduce his right side (Plus I would have had more territory on the bottom).
Now that you said it, H4 really looks like a mistake.

Seems like getting some comments from other (stronger) people helps more than reviewing it by myself