The Phobians have picked only one victory out of their last seven games and have dropped to tenth position on the log.
"I'm not happy with the players because we played well in the first half but wasted all the chances that came our way," Wellington said.
"We could've buried Wafa very early but the strikers failed us and that resulted to the draw.
"Moreover, the players didn't adhere to the instructions and roles I assigned them after the break. I'm still wondering what's happening to this promising squad but we will soon have antidotes to our struggles," he added.
Hearts will have another difficult test next week when they travel to Tema to face regional rivals Inter Allies who are coached by their former boss Kenichi Yastuhashi.