Tokyo 41

Tokyo 41 is a short CGA 'demake' demo of Tokyo 42 (Steam store link), initially created to appear as the (hopefully blatantly fake) "original" version of the game

You can read more about the story of Tokyo 41 and Tokyo 42 here (from Paul), as well as from news websites  here and here

Controls
-  WASD -  Move
-  Mouse  - Aim
-  Right mouse button - Zoom in
-  Left Mouse button - Fire (when pistol or rifle is equipped)
-  TAB - Cycle weapons
-  F- Use terminals