Youngstown State (1-1) had the first possession of the extra period and scored the go-ahead TD by going for it on fourth-and-1 from the 2.
The Colonials (0-2) converted a fourth-and-10 from the 25 to stay alive on their overtime turn. But Derek Rivers sacked Robert Morris' Mathew Barr on the next fourth down to seal the win.
Wells' other TD pass was a 1-yarder to Shane Kuhn that tied it at 14 with 7:01 left in the game. Wells finished with 107 yards passing while Jody Webb ran for 99 yards and Martin Ruiz added 95 yards and a TD run.
Rameses Owens ran for 152 yards and two touchdowns to lead Robert Morris.
AP College Football website: www.collegefootball.ap.org