Hi Ir_Kamikaze!

About the opening:

• It seems that the first 3 halfmoves belong to some sort of variation of the Alekhine's Defense (1. e4 Nf6) but your second move (2. Nc3) (leads to the Alekhine's Defense's Scandinavian Variation?) is more rarely seen but there are games with 2. Nc3 as you can see here; people just tend to play 2. e5.
• The position after 2... Nc6 could also appear after the moves 1. e4 Nf6 2. Nc3 Nc6, which is known as the Nimzowitsch Defence.
• After 7... d5 the position looks like a sort of the French Defence (1. e4 e6). Maybe Pelikan Variation (1. e4 e6 2. Nc3 d5 3. f4)?

Little analysation to the end:

• As we can see, 17... Nc5?? is a quite harmful blunder. 17... Qb6 keeps an even game.
• 18... Bf5?? leads to mate as you already know :-) Faster would've been 19. Ng5 Nxd3+ 20. Rxd3! Bxd3 21. Qxh7#, mate.

After all, the game was nice and congratulations for the win!