Heidorn's winning kick was from 38 yards. He also had a 30-yard field goal to give the Sycamores (6-3, 3-2 Missouri Valley Football Conference) a 17-15 lead with 2:06 remaining.
Marcelo Bonani put the Bears (4-5, 1-4) ahead 18-17 with a 41-yard field goal with under a minute left in the fourth. Following the score, Shelby Harris' kickoff went just 35 yards and the Sycamores' Aaron Killebrew returned it 32 yards to the Bears' 38-yard line.
Perish had 144 yards passing and a touchdown. LeMonte Booker ran for 116 yards.
Kierra Harris had 159 yards passing and a touchdown for the Bears.