Asteroids game in Python

This is my final project for the "An Introduction to Interactive Programming in Python (Part 2)" Coursera online course. To start the program click on the play button on the upper-left corner. Use the cursor keys and the SPACE and destroy the asteroids. My record is 125 point :).

The game's URL: http://www.codeskulptor.org/#user40_T3OE926tqa_11.py

Here is a screenshot of the game: