A few thoughts. Fair warning, a lot of what I'm going to say is stylistic preference. I can't seem to download the SGF, so my suggestions will have to be all text.
4: This seems fine, and reasonable. 5 makes it unlikely that you'll get much on the bottom, so 6 seems forced, after 4. Once alternative that I would consider is approaching directly at P3 or P4, if you want this sort of disruptive idea. After P3, if your opponent claims the empty corner, you can double-approach or taisha, or have any sort of fun.
8: While this is hard to argue against, it forces black's next move, which gives black good potential over that whole right side. You also have good potential on the left, but black becomes spread farther from the side with 9 than you are. At this point, I would consider other options, like O17 (my first thought, as I am used to Kobayashi stuff), N17, K16, and K17. I kind of like WK16, then if BM17 or something, C15 gives you influence and fast development, while making black's top right invasion ripe. As a matter of fact, consider R17 before C15 in that variation?
10: Yes, K4 seems reasonable here. Any group dropped into the left side after that would likely become a relatively weak 2-space jump.
11: Yes. Or tengen.
12 or 14: R17 is getting too big to resist.
16: Maybe a sabaki play to help R14. Q12, Q11, R11, or R10 all look interesting. Of these, I kind of like R10. It threatens to sacrifice R14 to make a stable group below, or do the opposite. Obviously, black will get scary thickness outside if you live inside here, but sabaki play could let you choose between running or living. The problem with your double-approach is that you make your opponent defend again, and both O17 and R14 become weaker.
20: At this point, you're not going to find something to attack around here. I like the shape of the shoulder hit at L16 better. If you could afford to cap K15, that would be great, but he can split you. The shoulder hit buys you space and stays connected better, I think.
24: Yep, K15 is the biggest play for 24 and 25.
45: Black should extend again, to P12. Black needs more liberties to hurt you.
85: Should have been at O14, I think.
Since you only asked us to look at the opening, I'll stop here. If you have any questions about any of this, let me know. And remember your grains of salt.
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can be bad, but it's at least awkward, or more difficult than a komoku or hoshi. Black's first four moves on the right make a very nice formation, one you'd like to prevent (just 49 occurences in the eidogo database). The easiest way is the wedge, though approaches to the top right are also popular. I do not think the 3-5 plays nicely with that strategy. 
and 
, but it is not obvious to me. The press at a seems undesirable, which leads to the more complicated world of pincer variations (well, there's the taisha, but that's a black hole to me).
As always, no guarantees. 