Walsall took the lead when Richard Taundry fired home after Alex Nicholls' shot had been blocked.
Ince made a save from a deflected Wayne Brown shot and Rovers keeper Mikkel Andersen stopped a Dwayne Mattis drive.
But it was to be Ince's night, the goalie diving to keep out Jeff Hughes' penalty and then beating away the follow-up effort from Paul Heffernan.