Oatsvall's final pass in the rally was an 8-yard toss to Willie Miller with 2 seconds remaining.
The Golden Eagles (1-1) won despite committing five turnovers - three fumbles to go with two interceptions thrown by Oatsvall.
Commerce took a 19-6 lead into the fourth quarter before Tech's David Gist scored on a 1-yard run to draw the Golden Eagles within six with 9:12 remaining.
Spencer Long raced 69 yards for a touchdown to put Commerce up 25-13 and the Lions (1-1) failed on a two-point try that would have given them a 14-point lead.
Oatsvall then finished off the rally, leading the Golden Eagles to touchdowns with a 4-yard pass to Jayvian Allen and the winning pass to Miller.
Oatsvall finished 20-of-26 passing for 226 yards. Gist had 67 yards rushing and Miller caught four passes for 93 yards.
Eric Rodriguez was 14-of-22 for 169 yards with two touchdowns for the Lions. Spencer Long had a game-high 90 yards rushing.
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