Nice to hear from somebody.
I'm currently writing a book, so QuestORama is on the backburner. I don't think I'll work on another software project until I can find at least ONE more person to work with. After QuestORama, MineTank, and the others, I can see now that I can't complete a project without another person to work with. I have to have a sounding board, if nothing else.
Multiplayer would be amazing, but the black magic necessary to make a server and clients work is far beyond my knowledge.
The game saves itself as you go, usually every 5 seconds or anytime you make a big change like editing a gun. Every time you reload the game you should see your saved game list. Your options are always either a game from the save list, deleting saved games, or making a new game. Every new game comprises multiple levels, but there's no end game boss, so as you tunnel into the levels you'll eventually hit dead ends as you reach the limits of the server.