Jon Nurse's first-half brace ensured the Daggers took their fight for survival to the final day, with Danny Green firing the third late on shortly before being sent off for a second bookable offence.
Still said: "It was a good performance, we worked hard. It was a well-deserved win and it gives us a chance next week.
"We made a great start and once we started bright I thought we were in the ascendancy. [Goalkeeper] Tony Roberts has not had too much to do. We had a few efforts on goal and I thought we could have had a few more in the first half. But the performance was first class.
"It's been an unbelievable season, to play in the last game of the season still with a chance is fantastic.
"I believe 99% of people didn't believe that would happen, but we always believed we had a chance and we've got a great chance now."
Source: PA
Source: PA