O’Neill felt his side deserved a draw at least in the clash on Saturday, but Villa lost after a penalty goal by David Dunn in the 89th minute made it 2-1 to Rovers.
The Villa boss told Sky Sports: “I thought we had certainly done enough to get something out of the game and it was disappointing to concede so late on.”
He added: “I have been delighted with the team – I think we won six consecutive games and we have been doing very well.
“This was a difficult place to come to – don’t give them many opportunities to get it down and play it and we thought that if we could do it, then we might be able to open them up and it just second half didn’t really work out like that.
“However, as I said earlier, I thought we had done enough and I thought we deserved at least a point today.”