The game you show is not the Meran. It's an anti-Moscow gambit.
The Meran is 5.e3 e6 6.Bd3 dxc4 7.Bxc4 b5.
After 5.Bg5, black can play 5...dxc4 6.e4 b5 going into the Botvinnik System, or 5...h6 after which white can choose the quiet Moscow System (6.Bxf6 Qxf6) or the anti-Moscow gambit (6.Bh4 dxc4 7.e4). Or black can go into the Cambridge Spring QGD with 5...Nbd7 followed by Qa5.
Hey guys, I found this somewhat risky but risky opening that even GMs use. The QGD is quite normal but then, we enter the Meran system, producing gambit-style play. So, I just need some help analyzing the game so I can study this game further and any thing on the Semi-Slav, Meran would be nice! :)