For an 1800 FIDE player, your opponent played pretty poorly - it's one thing to play a subpar opening system with the hopes to complicate things against an unrated (although you're better than the typical unrated I think), but playing moves like Bxc6 (without even waiting for ...a6 to gain a tempo at least) and then even Nxc6, trading off the strong knight (which may be forced, since white doesn't like ...Bb5, but that means that white's position is already not good).
So basically white played a horrible opening that didn't give him any chance to fight for anything except for a draw.
I think you should not have castled so early, but instead focus on the queenside, with something like 12...Rc8 instead, since it's a logical move, and it stops white from trying stuff like Nd2, g4, and g5 to attack your king (which is the only thing he can do to complicate the position, since his dark bishop is useless).
Obviously, allowing 14...Nxe4 wasn't great, and I think your advantage more or less disappears after that. I would have also played 14...Nf6, with an advantage, since your knight can take advantage of the weak square, while the opponent's knight can't take control of your weak square without getting traded off.
You played the endgame not too badly. I felt some ideas were questionable, but apparently you were under time pressure.
Overall, the game wasn't too bad, but your opponent played really weak chess, and basically didn't try to win at all.
Here i will post the games , if you want to see my Recap and comments about everygame please look here POST#24
https://www.chess.com/forum/view/general/first-over-the-board-tournament-suggestion-openings-ideas-etc?page=2
60+30 FIDE rated. Only players close to 1600-1700 FIDE or above please.