Missed win??

Hi all,

Just finished a game that went in my favour very early on (I made two queens within my first 8 moves).

The analysis is telling me that I had a missed win in this position (I made the move shown by the arrow):

In the above, I captured his pawn, leaving my bishop delivering check, allowing me to take his rook (adding a queen at same time).

The analysis reckons that what I did was a missed win and the below is what the engine suggests was the best move, but I can't see how this can be a better move that the one I made (which put me in such a strong position to then go and win the game):

What am I missing here; it's clearly above my level of thought at this stage!

Thanks in advance.

c2 discovery check also protects d1 for your queen. Qxb4 Qd1#

Ah! I See that now; I would never have got there. Thanks very much for the help. Could've ended this game a lot quicker!

how will you proceed after c2+ Ke2

I don't get it

It's right there in the posted image showing the best move.  You drive the white king to mate in the center of the board.

7.  ...    c2+

8. Ke2  Qd1+

9. Ke3 Bc5+

10. Ke4 Qd4+

11. Kf3 Bf4#

or

10. Kf4 Qg4+

11. Ke5 Qd4#