The 'Retake Mass Effect 3' campaign has raised $80,000 (£50,400) for Penny Arcade charity Child's Play.
BioWare co-founder Ray Muzyka revealed that the Mass Effect 3 team was exploring content initiatives to provide further closure to the story.
"I don't believe anyone can or should consider this effort to have been anything but spectacularly successful. As evidenced by the statement from Dr Muzyka yesterday, we have made our voices heard," said Mass Effect 3 campaigner Robb.
"Those of you here have taken special care to be heard in a polite, positive manner, and I believe that this is a major contributor to that success. We have shown our sincerity and passion. We have brought positive attention to the Retake Mass Effect movement.
"Make no mistake. This effort has been victorious."
He added that the group will continue to monitor future developments ahead of BioWare's planned April announcement.
The game's climax was recently defended by BioShock creator Ken Levine, who said that further changes would lead to more disappointment.
Director Casey Hudson previously defended the ending, claiming that the polarising conclusion makes it more memorable.
Mass Effect 3 shipped 3.5 million copies worldwide during its first week on sale, making it the biggest entertainment launch of the year, according to publisher Electronic Arts.
Mass Effect 3 is available on Xbox 360, PS3 and PC.
> Read our review of Mass Effect 3
Watch the launch trailer for Mass Effect 3 below: