Brighton their third round tie 6-0, with Harry Howell and Yasin Ayari also on the scoresheet.
Hurzeler said of Gomez: "We knew before that he has an unbelievable shot, but today he proved it on the pitch.
"We are very happy for him because he always practices and that's the main thing, you have to keep working, keep improving, you have to develop your skills and he does that every day, so I am very pleased for him."
On Howell's first goal, he continued: "I was pleased for him. At the beginning of the week I said we only put players on the pitch that deserve to play and he deserved it, and he scored.
"He has worked really hard for this goal, but he got into the game, he was always available, he always wanted to have the ball, he showed good body language when we lost the ball and this is the main thing that we have to keep on working with him on.
"He is an unbelievable player for his age, he is a big talent. But talent isn't enough, you have to work hard, you need to do the basics right if you want to do well."