Amazing game! Love the Wolfenstein 3D vibe! Love the visuals-sounds! With quite a lot of content!
Except the main need for savegames (that other people also posted about - as the game is quite large) the game could use an improved mapping system so for example we can access map of other areas and not only current area map. Maybe a full screen map screen with notations about left over items, locked doors, etc.
You should put the game in a folder inside the zip file.