County recorded their second Blue Square Premier win of the season against Grimsby thanks to goals from Sean McConville and Tom Elliot.
It was a positive end to a miserable week for the Hatters after Tony Evans' bid to buy a majority stake in the club collapsed.
"I'm very pleased. It was a good display," said Hamann.
"We defended well and we took our chances. It was a very good day for us."
He added: "We've defended well throughout the season so far and it was no different.
"Our keeper Matty Glennon has been outstanding of late, a rock at the back. Tweet