how was this sorta win?

Game 3218403i think white blundered in the oppenning.

I thought you played the game well. Black's choice of opening, the Alekhine Defence, is just about the worst choice for a beginner to try to play. It encourages White to over-extend, but you need to be pretty good to defend the sort of positions which arise from the opening and last long enough to strike back at White's weakened pawn structure.