Great opening play, I can say! There're still moves that weren't necessarily the best moves:

• 7. Nf3 would've been a bit stronger than 7. Nc3 because it controls the important e5 square and prepares king side castling. After possible continuation 7... e6 (releasing the king's bishop) white could play the forceful 8. Ne5! creating a cramping effect to black's position right from the start.
• 9... Bg4? is a serious mistake because it lefts the knight in c6 en prise. White could now play 10. Qxc6+ with winning game (e.g. continuation could be 10... Bd7 11. Qc4...)
• 10. Ng5 isn't the best move here because after 10. Ng5 ... 11. Qxf7+ it's not a mate. Black could've played 10... Nb4 with a reasonable game (continuation 11. Qxf7+ Kd7 12. Bb1 (black was threatening to take it) 12... Kc8 and the king gets to safety).
• As you said, 10... Qd5? is a blunder but 11... h6?? is even worse because it gives white a mate-in-5. Better would've been 11... Nxd5 (continuation 12. Qxc6+ Bd7 13. Qxd5 e6).

After all, it wasn't a horrible game :-D