I believe the tactics adopted by TT at the start of game was correct, sit back and allow Panama to do the early running, then look to pounce on the counter. Problem is your defenders had a lapse on the Panama goal, which meant you had to change strategy prior to first half.
Fatigue set in as the game went on for both teams, but Panama looked to have slight edge in fitness.
Was not surprised when Panama surrendered the lead, its a feature of their game during the group stages.
I expect all remaining games in the tournament will be tight affairs.