Could my opponent equalize?

I ended up winning this game but I'm not sure if it was only because my opponent made a key blunder on move 22.  All comments and suggestions are much appreciated, on any move, not just Qxa7 as opposed to my choice Nc6.  Thank you for the help

I'm pretty tired, but I will try to give some advice.

I don't see the point of Bb4. The exchange will just strenghten the white canter and open up the b-file, making queenside castling dangerous.

Then you queenside castled. I think it's a mistake. Your pieces are all very cramped, and in no position to start an attack which is the only reason why you would queenside castle. Meanwhile white's pieces have a lot of potential, and the rooks easily come in with one move on the big file.

I felt 16...Na5 was not needed. The threat of Bxb7 can be neutrilized with 16...Rdg8. Even though your position is more cramped than ever now, your rooks are at least positioned for a counter attack and your king can now run to d8. It's risky... As I said, I'm too tired to calculate what would happen.

21...Rd5 seems alright maybe. Only continuation I see is 22.Nc6 Kd7 and it looks like black can hold off the attack. You need not worry about material, you are an exchange and rook up.

Bb4 was just a developing type of move, i was hoping it would allow my to post my knight eventually, In retrospect i think you are probably right about that, although it is nice to develop a piece into a pin

I thought the queenside castle was the way to go because things would have opened up more after the pawn storm on the king side started, but you could be right about that

I think Na5 was absolutley needed because Bxb7 is not the threat, the threats are Qb5 and Rxb1 which all put pressure on b7, the mating square

I haven't checked all of the tactics, but I'm pretty sure 16. ... Na5 is not only not needed, but is incorrect. The correct move is 16. ... Nc3! The point is that White's rook can no longer come to the b1 square, so play might go

16. ... Nc3!  17. Qxc3 bxa6 18. Qc4 Kb7 19. Rb1+ Ka8 20. Qxa6 Rb8

where White's back rank weaknesses become a liabilty. Another option for White is

20. Bxc7 Rc8 21. Bg3 Qxa3

and Black's position looks precarious, but Black is able to consolidate his material advantage.  After 16. ... Na5, correct play for White is

17. Rxb1 Bc6 18. Qc3 bxa6 19. Qxa5 Bb7 20. Rc1 Rd7 21. Ne5 Rd5 22. Qc3 Rd6 23. Qb4 a5 24. Qxa5 Kb8

and at a minimum White equalizes with

25. Rxc7 Qxc7 26. Qxc7 Kxc7 27. Nxf7 Kd7 28. Nxd6

Upon close inspection of the position I think your opponent needs to stop drinking heineken while he's playing.

lol i agree that's probably a wise decision