Try my game-so-far!
You must have Python 2.5 installed.
You must have Pygame 1.7.1 for Python 2.5 installed.
I have not tried to make this work on anything but Windows, and I'm using Windows 2000, so be warned.
There is no gameplay, just a GUI and map editor. In game mode, select with left clicks, re-center the map with right clicks. In edit mode paint with left clicks and dragging with the left mouse button. Re-center the map with right clicks. Hit an "exit" button or your escape key to quit at any time.
I don't think there's anything (straightforward) that will go wrong, so let that be the challenge: If you can find a cool error and tell me what you did, you win!
If you have undertaken and understand the above, or even if you manage to stumble through on sheer cussedness, you may now download Isostrat v0.05.
Tell me what you think and how it goes, if ya like. If you're particularly adventurous, go ahead and look at the sourcecode.