could I have taken the game further (maybe win)?

Thanks in advance.

maybe...XD

There's nothing better for you, but you were lucky to get away with a draw from there!  From that final position, Re8 & Rh6 both look winning for black to me.

I think only a pawn White loses, 33...Re8! 34.d4! Bf6 35.Nf4 Rg5+! 36.Kf1 Bxd4

Or am i wrong?

You are lucky draw is the best thing or you would of lost

If white played 33. d4 black would not play 34... Bf6? but rather play 34... Rxe6 35 dxe5 Reh6

Right, on Re8, d4 is insufficient.  Interesting position, looks like something out of Tactics Trainer!  In fact, out of curiosity, I plugged it into Crafty and confirmed -- it's scoring that position as -5.67 after Re8, easily winning for black.