Oel vs. Ecthelion: Opponent gave up (too?) early

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Dear reviewer,
Thanks for taking the time to analyse my game. I left some questions in the sgf file. Before my opponent did an easy mistake and surprisingly resigned immediately I did not feel very confident. Therefore I would be interested in general advice and pointing to some mistakes but also your evaluation of the game at the point where my opponent gave up (or immediately before he did the mistake).

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Thanks, YoungPro, for your great review. You provided me with many important corrections and ideas. I will have to go through the review several times.

I also really liked the evaluation at the end. It's very interesting to see how a very strong player evaluates such a situation. Thanks!