Slade said: "There were some good things from us. We created chances all evening and to be honest it became a little bit too open for my liking.
"I thought there were too many chances for Orient to be fair, in the end. But it made for an entertaining game and I thought it was going to penalties to be honest.
"They managed to rescue a goal right at the death so it was disappointing from that point of view. Yet there were some positives to take out of the game. There were some good performances."