Peter Murphy notched a stoppage-time equaliser to peg back fellow strugglers York to a 1-1 draw on Saturday, just as James Beattie and Lee Molyneux did in the 3-3 draw with Burton and 1-0 win over Wycombe respectively over the Easter period.
"It's a great time to score," Richardson said. "It just shows the belief in the lads and what they do.
"We're not in August where we can afford to down tools and feel sorry for ourselves, whether it's in the first minute or the 90th minute we must go right to the end.
"Goal difference and everything else comes into the frame at this time of the season.
"It can affect everything you do. The lads are pulling together and having a really good fight and trying to get over that line as quickly as we can."