Did He Make a Mistake?

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neospooky

This is a recent game I played in a tournament.  I have been over and over this game and cannot determine if he made a mistake.  I submitted it to the Chess.com analysis engine and it showed a single inaccuracy very late in the game but I'm not even sure that it should have counted.  It wasn't a bad move.

Since I don't have any fancy engines for analysis, I can only comb through it move by move on my own.

Anyone spot a weakness?

Mainline_Novelty

i might have played 2.c4, but thats just me.

Mainline_Novelty

i would've played 3.d4