I'm really sorry about the crashes that some people have experienced when collecting stars. I've uploaded a new version of the game that uses a workaround Unity's QA folks provided to me. Please leave a comment if you are still experiencing crashes.
@frondome: there's a really basic level editor hidden in the game. Try hitting E from the main menu. (Note: High scores will be disabled once you've edited the game.) If people are interested, I might expand this feature, enable sharing of custom levels, etc.
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