Can anyone spot any kind of tactical breakthrough at move 6. I moved Bxd4, and the other guy made a mistake resulting in a loss of queen for him. I want to know if there was any forced capture (or checkmate)?

Or any serious blunders i could have made in the game? 

hmmm bishop g5 i dont like..at this points i woulda fianchetto my bishop, because thats why he played g2 right??? that also prevents any nasty tactics, why go on the attack?? developt first whoever just lost their queen

You would get a better game in theory with 5... bxf2+ .

He should have had the advantage by simply playing 7Bg2

You did not have a tactical break through. You opponet lost the game when he did not play 8. Bg2 and you made a good move after he played 8. Bg5?

Earlier you should have considered 5. ...Bxf2+

For you to have a break through so early your opponent would have had to play badly.  He played reasonably well until his 8th move.

5. .... Bxf2+!

That isn't necessarily good for Black though.

Please explain.

It looks akin to 1 c4 e5 2 Nc3 Nf6 3 Nf3 Nc6 4 e4 Bc5 5 Nxe5 Bxf2+...which is rather dubious.