Here it is, my entry for minimalism. Pretty simple concept, 2 player "fencing" game, players have 3 stances; Top, Mid and Bottom. Top beats Mid, Mid beats Bottom and Bottom beats Top. Controls are as follows:

Player 1 (red):
Left - A
Right - D
Top stance - T
Mid stance - G
Bottom stance - B

Player 2 (blue)(remember to make sure Num Lock is ON):
Left - Left arrow key
Right - Right arrow key
Top stance - Num key 8
Mid stance - Num key 5
Bottom stance - Num key 2

Currently I have only uploaded source code, so to run please have Python 2.7 and Pygame installed and run:

python showdown.py

I am trying to get an executable version for Windows and Linux, but it all seems very confusing.
I'll see what I can do :/