Good first game, nicely posted. In the opening try to get you peices developed and you king castled before you attack. This means that when you do attack your king is safe, and you'll have all your peices ready to jump into action.
What is the deciding move?
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EDIT: didn't see you where looking for a 'deciding move' but I don't think I can help you with that anyway. I believe you won because you took more and more material away from your opponent and eventually won despite some blunders! I appologize for not giving you what you want but hopefully you will get some benefit from my advice anyway.
The author of Logical chess move by move, Irving Chernev, would probably tell you Don't chase after pawns at the cost of your own development. Other than that 4.Nd3 is inferior to 4.Nf3 because you block your d-pawn. I know you moved the knight to d3 in order to attack the black bishop, but one must strive to avoid making weak one-move threats that are so easily parried (of course black will defend/move his bishop and then what have you acheived?) and instead try to improve ones position in the best way possible.
I have the same problem with 6.e5. Once white moves his queen it actually WORSENS your position since, like you said yourself, it paralyzes your knight.
The amateur's mind by Jeremy Silman is a book which I think would greatly improve your game. It teaches you about development and also about the pitfalls of said one-move threats and would really recommend it!
Hope that helps!
This was my 1st turn-based game, and one of my favorites. I was just wondering what the key move is. I think it's 40. h5, but I want other peoples oppinions.Note: 21. Rd6?? does not count as the deciding move.