Palace were beaten 2-1 after Jack Grealish struck in injury-time.
"Yeah, obviously, we are very disappointed in the result,” Kamada told Palace's website.
“I think we performed really well until we conceded. We had so many opportunities to score. We should have decided the game, but we couldn't.
“And then after we conceded, the stadium atmosphere was really difficult to play in for us. Yeah, it’s disappointing.
“I think in the second-half also we were doing very well, but in the Premier League, when we have the opportunity, we have to decide the game.
“Obviously they are also a good team, and there are so many good offensive players. Yeah, I think if we would have scored in the second goal, it would have been a completely different game, but we couldn't do it.”
Kamada also refused to blame fatigue on the result, adding: “Obviously, we have so many games, but as our gaffer said, we have no excuse. We all wanted to play the European competition, so this is not an excuse.”