goal.

In the 2015-16 season, Heyer established himself as a regular starter under Atalan in the second half of the season. He contributed with three goals in 26 appearances, of which 18 were in the starting lineup, with the team finishing with the Regionalliga West championship at the end of the season. In the subsequent promotion games against the Regionalliga Südwest champions SV Waldhof Mannheim, Heyer appeared in the 2-0 win in the second