I liked almost everything you did.
One of white's biggest problems is his b2 bishop isn't playing.
Which is why I would have no problem with 27...Bd5 and after takes twice on f6 white has no threats, material is even, but he's basically down a bishop, and you have targets on both sides of the board.
So, maybe you would have lost due to time, but your position was actually very good.
Two moves I didn't love were Qc7 and Nc6. Usually in these structures the d and c files open, so you'd rather have you queen end up on the a, b, or e file. And in the position on move 13 black is going to be using both the c file and the a8-h1 diagonal, so Nc6 is just in the way.
Thanks :) Yeah, I did resign prematurely, which was in part due to time pressure. I guess part of losing was psychological as well - "oh I'm going to lose like this again of course".
@ultimatechessss - Yes, but Bf8 was probably better (and both were better than f6).
I played the above game an hour ago at 10/0 controls, and it's entirely typical of the series of losses I'm going through right now. I've been a low-mid 1600's blitz player, but now I'm falling below 1500 and I literally can't win a game, against anyone.
The problem is, I can't see what I'm doing wrong, and so I don't know how to fix it. I get a small positional advantage. I have some pressure, or I win a pawn, while the opponent seems to have nothing. A few moves later, I realise I'm in a losing position (usually with the help of at least one obvious tactical blunder).
So what I'm wondering...besides the obvious amateur mistake at the end, is there anything obviously flawed about my strategic play or thought process in the above game? I'm really desperate to hear any advice. My current thoughts are that I should have seen that the white knight would go to e5, where it would be too strong, and that I wouldn't be able to play f6, or capture the knight without de-isolating white's d-pawn anyway. So then the entire idea against the isolated d4 pawn was flawed? But this seems ridiculously difficult to see at my level!
Thanks in advance for any help!