I'm assuming you meant to puzzle to start from perhaps move 11? But even then none of black's moves are forced nor even the close to the best. 11. d4 Black can do a number of moves besides 11...Bxd4. A simple one would be 11...exd4+. 11...Bd7 looks quite strong though. After Queen moves then maybe 12...exd4+. 

But either way after 11...Bxd4 12. Bh6+ 12...Kf7 or Kg8. Not only does black pin his Queen to his King with 12...Qg7 but he also puts himself into checkmate.

The puzzle looks very interesting though from move 11, but you need to have it so the moves would be more forced, or else something like 11. d4 is not the best move and it people would most likely not do that.

Relooking at the puzzle now,  if black does 11...Bxd4, I believe 12. Bg5 is a stronger move. But not so much if black is still open to do Bd7. I believe this could be an interesting puzzle if maybe the light-squared bishop wasn't in the way also if your king wasn't so vulnerable. To the e-file for 11. d4.

I'm bored so I'm going to try it out:

bad puzz