After Qf5+ white plays Bd3 and you just wasted a move.
I'd go with something like a4.
What would black do?
Sort:
I'd go with 1... a4 too. If 2.b4 c5 is interesting because it doesn't seem as if the pawn can be defended again and 3.dxc5 allows 3... Qxc3 threatening both Na3# and Qb2#. If 2. Bxc4 dxc4 3. b4 c5 again creates plenty of weak pawns, though there is no mate threat here after Qxc3. The problem is, I don't see a clear continuation after 2. Kc2.
throw a cucumber at the king-that will make him angry hehehe...
I tried to make a puzzle of how black would end up being at a big advantage, or possibly win, but I couldn't see it. I finally found what to do. So I ask you: what would black do? I decided it would be better not to have it a puzzle, but rather, find a sequence of moves that would best fit you.