Life In 19x19

Decided to stay up late and play some Go. This player has a record of wins denoting what I believe to be skill higher than his KGS rank, so all things considered I am pretty happy with this game except for the several obvious blunders I made.

I would appreciate any advice on my overall play, I definitely messed up on a simple life and death and allowed myself to be pushed around a few times by just not paying attention to potential ataris. I am more looking for thoughts on what were good moves and what were bad moves that aren't the really obvious ones. Thanks!

Just a few thoughts:

7: allows white to make a base. Why not pincer at r7?

27: doesn't seem to do much right now. Why not attack the weak white group at r7? After 37 the whole area belonged to white.

51: There are so many big points on the board, e.g. c15, j17, c11

117: That's a small endgame move (even a gote one if you were in the endgame phase). Try something bigger, e.g. c10

127: Allows white an easy escape. Just cut with n12 and then o11 and o12 are miai

137: On tsuke play hane

251: Are you afraid of playing ko? Go and look for some ko threats (some examples that caught my eye: n1, n13, c18, s5)

199 is a mistake. You can live there, try to figure out how-- it's a good problem. (EDIT: there are two ways to live. Find both.)

26 is terrible (not your fault, I know).

In the contact plays in the lower right you seemed to leave an awful lot of cutting points. Don't play so tightly.

yea, 199 is one of the simple life and death mistakes i was talking about. playing either p1 or o1 or q2 seem to give life there, basically every easy to spot move that I was a fool about.