Dementium Remastered - info on difficulty settings, saves and other upgrades

The following comes from Renegade Kid's Jools Watsham...

New gameplay difficulty options include Normal, Hard, and Demented. We've added a manual save system (adopted from Dementium II). Enemies no longer respawn; a dead zombie stays dead! A lot of time and attention has been spent on increasing texture resolution, adding specular, detail, and normal maps to enemies and environments. Cut-scenes have all been re-rendered using new remastered enemy/environment art (not autostereoscopic 3D, though, to save on ROM size)