The Kent club extended their lead at the top of the table to six points with a 2-2 draw at Fleetwood.
Allen said: "It's another point towards our total.
"It was fierce and very difficult, especially when they brought on the two strikers. As a team they were difficult to defend against.
"It was probably the best we've played for a very long time. They were absolutely fantastic. There is a probably a little bit of a feeling of disappointment that we didn't get all three points, but it is a good result.
"We had great support and I think all in all it was a good day for us."
Gillingham looked in for an easy ride when they took the lead after just three minutes. Nathan Pond gifted the ball to Callum Davies who set up Danny Kedwell to apply an expert finish for his 14th goal of the campaign.
But Fleetwood refused to roll over and equalised just after the half-hour mark. Junior Brown's cross was headed against the crossbar by Gareth Evans but record signing Jamille Matt was perfectly placed to nod home the follow up.
The visitors regained the lead before the break, Charlie Allen with a free header past Scott Davies in the home goal.
Alexander's team were far from buried and pulled level again with just over 20 minutes remaining. Brown forced his way through a crowded area and Matt got the final touch.