Citadel is a faithful remake of the original game System Shock created in 1994 by Looking Glass Studios.
Large number of bugfixes primarily with saves, add missing plot elements,, fix AI forgetting player immediately and fix over 55 other bugfixes. Other notable things: cutscenes use MAC videos, death scene plays on death to menu, fixed lots of saving issues, log files are now put automatically into Citadel_Data/StreamingAssets alongside the config and save files, save files use a lot more text information allowing easier debugging and save-hack mods.