The hosts were left to ponder what might have been had Niall McGinn converted a 10th-minute penalty - and Brown is demanding more cutting edge from his men in the future.
"It's an example of so many games here," said Brown. "I think that was the fourth 0-0 result, and on every occasion I've felt we dominated the game. We need to be more clinical.
"When you miss a penalty, it's the ultimate in missed chances, and then the header that fell to Peter Pawlett was even easier to score.
"Any informed observer watching that will know that the team is playing well, and I'm delighted that that's the case.
"We lost Russell Anderson with a training injury yesterday, and Andrew Considine to a broken leg a couple of weeks ago. Chris Clark similarly - he's had an operation. We've still five players out but without them, I feel that the team is playing well enough."