Sigma: the Game
A downloadable game for Windows, Mac OS X, and Linux
Demo of the yet unnamed point and click game. Contains a fully functional chapter 1 so far.
Mouse controls, click on things and drag inventory items around. F12 quits the game.
Edit: now has an .exe build. Just get demo15_win.zip and run /demo15/demo15.exe.
(For demo15_src.zip, unzip the file and run /wappurc/demo15.py from the command line. Must have Python 2.7 and Pygame 1.9.1 installed.)