The Robins have lost just one league game so far this season - the dramatic 5-4 defeat to Bradford - and are currently four games unbeaten following Saturday's 1-1 draw against high-flying Rotherham.
And despite lying ninth after the opening eight games, Allen told the Gloucestershire Echo: "I am not satisfied because we have got to do better and I want to win at home with a few goals and clean sheet.
"I can't tell you how hard these players work, how conscientious they are and how demanding we are of them.
"Their focus and intensity has been awesome, but we have work to do and we have to improve because I don't want to have to come from behind. We need more possession to dominate games at home.
"We are hard to beat, but we have to make adjustments to improve our attacking play without losing that resilience. That's a fine line, but there is room for improvement for sure."