By telling me this you have saved the princess and completed the main objective of the game; for she can not be saved by anyone without crossing the bridge - sadly you are not the first.
Viewing post in Quest of Eternity: The Great Decay comments
I still encountered some issues with the enemies running in circles, but I saw that the bridge issue was fixed and I was able to finish the game. Also found out this playthrough I could pick up weapons so I didn't have to do it with just his fists, ha. Completion screenshot.