Mistake Capitalization


On move 11, you didn't castle to protect the e-pawn, or he would have taken it.
Not sure why, but one of the things I constantly see in lower-rated games is a sort of non-chalance with pawns, giving them away left, right and centre. Nimzowitsch says that the best way to remember the value of a pawn is that each pawn is a potential queen.
I think the position by move 11 really shows why you managed to win (other than the piece advantage), and it's probably a useful lesson to pick up (whichever side you are), his light square bishop is trapped horribly, he has a backward d-pawn (potential target), there's a hole on d4 because of the advanced c-pawn, and his queen isn't greatly positioned either. You've got two knights with a firm grip on the centre, and the d4 hole would be a great place for a knight at some point. Your light-squared bishop isn't hemmed in and is ready to break out and finish development, you're ready to castle, and you have a great half-open d-file to attack, and your central pawn keeps the threat of e4 open while controlling the centre squares.

There are alot of mistakes in this game for white but im not going to say all of them.Thats why white got mated.