Please analyse my game - Queen's Gambit Declined, symmetrical (Austrian) defence

The game was played on Chesscube and I was not familiar with this variation of the Queen's Gambit. 

It's the first time I post a game for analysis, I would appreciate constructive feedback, if possible also on the annotated comments.

Thanks and good luck with your games!

Actually 7. ...Bg4?! is a bad move for black which with sharp play leads to material advantage for White, but the continuation is difficult to spot.

I played 8. Be2(Reasoning: Black threatens Bxf6 Qxf3 Nc2 check. Also preparing to castle.)

But a much better move is 8.Bb5+! as seen in the following game 

The slight difference here is that White had played 7.a3 Na6 before 8.e4 Bg4, which had removed the Knight threat Nc2+. 

While playing a3 first before e4 is probably a better option for White, Black still loses material if he plays  7. ...Bg4?! even if the black Knight is still at b4 

11. ...Nc6 is met with 12. dxc6 Qxe5 13. cxb7+ Kd8 14. bxa8+ promotes to Queen.

Otherwise Black can give up the c6 Knight by playing 11. ... Nc6 12. dxc6 bxc6 13. Qxc6+ Qxc6 14. Nxc6 , but even like this he is way behind in development and down a knight.

Note: I haven't used any chess engines so far, waiting for other players' feedback first.

Bump.

Since it's my first attempt at posting a game on this forum and I spent a few midnight hours to figure out how to post it  with annotations, I'll make one more attempt to get some comments.

If you read this but decide not to post an analysis, could you please very briefly let me know what was the deciding factor ?

e.g. game too long; game too boring; annotations hard to follow; don't like to read annotations; takes too long to reply(short one liner insights also ok)

Thank you

Quote from the sticky thread of the Game Analysis section: 

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1.  Annotate your game yourself before you post!  .  In order to receive accurate feedback, we must know what you were thinking as you played the game, and what you think of it now.  

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You played very solidly against an opening you didn't know about. Perhaps you were overtly eager to exchange pieces and release the pawn tension, but he played badly and didn't know how to exploit it.

After your disconnect, you should have played Rxd4!! winning a piece because if he retakes with the pawn you play Rc7 and win the queen for the rook. There is no way he can promote his passed pawn no matter how he moves. 

Thanks for the feedback, helltank, I appreciate it. 

Regarding the 37. Rxd4 continuation you mentioned, black has no reason to play 37. ... cxd4 instead of 37. ... Qxd4 ;  white would still have a winning situation despite giving up a rook for a knight, but it would become tricky considering I was low on time.

posistionally white plays well, 17... c4 would be my first consideration for blacks counterplay aiming to expand his queenside and bring her out later on