I don't like because of 5. .., dxc4 that makes your d4 pawn very weak. For example continuing with Ne7 and fiancheto de queen bishop pointing at d5 and after ensuring the blockage of d4 pawn with Nd5, move Nc6.
In my opinion, then you will have problems with your d-pawn, losing the iniciative.
Their queen also showed why it was a bad move. I think I'm better at tactics, and that's what saved me. I think a good example is how he went for 28... Nxf2, and then dropped the knight. He probably saw taking my knight as losing a rook, but 29... Rxf7 30. Bxf7 Nxd1 Bxg6 is eqaul in material, although it does give white a bishop vs. a Knight on a super open board. That passed pawn would have been an issue, but I had 2. 35... Rxf7 was probably best, since it loses 2 instead of 3.
This is a possible alternate for the game if they went with the large exchange instead of dropping the knight. I'm honestly thinking it looks best for black to drop their passed pawn and create other threats, but I'm always willing to admit that I made mistakes.
This was an interesting game. We went into this French advance sort of pawn structure but then I decided to try something that I haven't seen before (5. c4). Usually I'm black when I see the French defense, or black never follows through with 2... d5. My experiment probably wasn't very sound, to be honest. In the end my pawns were unstoppable. I was so sure of winning I didn't pay attention to checking their king to try to win their rook.
Thanks for any advice.