Introducing: autosave! If you close the game window (or quit the interpreter) and then open it again, you will find your game where you left off.
The "Reset Game..." menu option will start over without loading the autosave. This may be helpful if you run into an autosave bug which prevents the game from running at all.
The Mac binary is now packaged as a DMG (disk image) file, which will hopefully take care of the code signing issues.