This is a response to VC 23 Janine 8 ("GunShy Shogun")...
Glad you enjoyed Gunshy. Incidentally, Betsy gets the credit for finding it and encouraging me to add the Archipelago icons. And now for your questions...
1. The undo menu item does not seem to work, but there IS an undo feature. Just hit the backspace (delete) key to recall your last pair of tiles. You can keep hitting the delete key all the way back to the starting position if you want.
2. Ha! I choose those two symbols that look very much alike ON PURPOSE to add a little challenge to the game. They also serve to educate Archipelagoans about the subtle difference between a reply card like this one and a root card. The symbol just above the word-o-meter is a reply card tree button; your Gunshy card displays the slightly different root card tree button. So Gunshy is not just fun, it's EDUCATIONAL!
I also noticed that the option key sometimes seems to hilite tiles that cannot actually be matched; I assume this is a bug in the program.
3. I see no sound control in the program so yes, use your trusty control panel (or wear earmuffs).
4. Yes, color would be grand. This is why I highly recommend Shanghai. If you like Gunshy, Shanghai will blow you away!