Not bad! I like the Idea, and the game looks nice, (and I like that you can do nothing and just beat ghosts in a fair R-P-S) but the bar should really be visible for a few seconds before starting, because quite often the goal spawns so far to the left that you just don't have the time to react. But overall good job for only 3 days!
Would be nice if you'd check out my game too :)