Final Level: The Tower of Return
Why It Sucked: Last minute deaths are almost as big a cop-out as cliffhangers. Dark Void may not go that far, but Will does have to leave Ava behind for some reason. It basically boils down to "YOU GOT STABBED, I GOTTA GO, PEACE."
How We Would End It: It's clear the developers had something better in mind, but ran out of time and/or money three quarters of the way through development. That said, if you can't end a game right, at least end it happy. In our version, he'd carry her through the portal and they'd have tons of babies.