I've never worked on improving any of my pyweek games before. This is the first time im' doing it mostly because i'm not satisfied with what i've put together in the two days i worked during the contest. Any way after a few rounds of feedback, i've added another enemy type to make it a little more interesting. Improved the medal requirements and added the ability to pause the game :D.
Press escape to pause and you will see the pause menu. Once in pause menu, if you press esc again it will quit but if you just click (mouse) then it will resume. Also remember that you can make new patterns using "editor.py" available along with the source code. as you can see.. the pause menu is pretty simple and to the point. You can grab the latest executable version from project site