James Vaughan's 10th goal of the season cancelled out Ricardo Fuller's 27th-minute opener at the John Smith's Stadium, which ultimately earned the hosts a point.
"I thought we were really poor first half," Robins told Sky Sports News.
"The changes had the desired effect and I was really, really pleased with the second half, as pleased with the second half as I was disappointed with the first half.
"Even though it's the early part of the season, we've got to keep believing and keep picking points up."
Robins said that Vaughan was "devastated" after smacking the crossbar with his spot kick, but has backed the former Everton and Norwich City striker to bounce back quickly.
"He's devastated," the 43-year-old added. "He feels like he's let everybody down, it's the end of the world, but he'll be OK again tomorrow."
The Yorkshire outfit travel to Teeside to face Middlesbrough on Tuesday.