The 32-year-old started in the victory and showed his eye for goal with an accurate first-time finish to pull the O’s level on the 25th minute.
“It was a good workout and nice to also mark it with a goal,” Mooney told leytonorient.com.
“I was hoping that I would be able to score the first goal of pre-season, and thankfully that worked out to be the case so long may it continue.
“We probably started off a little sluggishly and let them get a little bit ahead of steam, but once we dealt with that I feel we had the run of the first half. The boys in the second half then performed really well with some very good finishes, so as a whole we can be very pleased.
As well as registering our first win of pre-season, the O’s also experienced their first run-out on artificial turf, and Mooney explained he believes the team will get used to the surface quickly ahead of the opening day trip to Sutton United.
“It’s the first time we’ve been on 4G and we have another friendly on this surface to get even more used to it. As pre-season goes on I expect we will probably train on it once or twice to get a bit more accustomed to the way the ball bounces and the way it rolls.
“From that point of view, it could have played a part in us starting slowly today, but as I whole I feel we played well and as you saw in the second half you can play some good football.”
With the O’s operating in a 4-2-3-1 formation at Harlow Arena, Mooney started as the sole striker before reverting to a slightly deeper role, and Irishman revealed he is happy to play anywhere Head Coach Steve Davis asks him to play.
“I started the half off playing as the main forward, but the Gaffer told me before the game that he would be changing it up as the half progressed so he could have a look at players in one or two positions.
“For me, there is no big issue as to whether I play right up top as the lead man, behind the striker, out on the left or right or even in midfield. I will play anywhere as I am just so happy to be back at this Club,” he added.
“The Gaffer has come in and it he has been brilliant to work with this week. I knew of him from playing against his teams previously, and he’s tried to sign me once or twice which is quite funny.
“We have struck up a good relationship already during the first week that he has been in, and we all know as players know what he expects from us. He is starting to get his ideas across and we have got another three weeks to build on them in order to get the season off to a good start.”
Having also seen fellow forwards Tristan Abrahams and Macauley Bonne contribute with goals in the victory against Harlow, Mooney finished by praising the young attacking players at the Club.
“I thought Macauley played well and deserved his two goals, and it came as no surprise given that he looked really good in training on Friday. He is a quick, strong lad and is going to be a good player for us this season.
“As well as Macauley performing well, Tristan showed good awareness to follow in for his goal. He looks a good talent so hopefully we can keep him fit and firing.
“Steven Alzate and Josh Koroma were also impressive, so we have a number of very talented young players in the squad and it is just about whether we can mold everything together now and strike up some partnerships over the coming weeks which I’m sure we will.”