I just finished another small flash game, made for a contest.
The theme was winter, snowballs, lots of them.
The game is very simple, move your mouse left and right to aim your cannon. It shoots automatically, so aim carefully.
Also, you must avoid the incoming snowballs thrown by the aliens.
Here's the link.
A youtube video: http://www.youtube.com/watch?v=gUCglpe8cGk
But it looks really fast, and I didn't get the proper feedback whether the alien was hit or not (at least not from the video). Anyway, good luck in the compo