Good job on your first game! This is a great step forward and awesome to have something to share with others.
Some suggestions I have would be to try to adjust how random you make the mice's movement. The way the moved kept them at the edges, it would be nice if they scurried across the screen. Also, I think it would be nice if the sound played when you click depends on whether you clicked on a mouse or not. A bit of audio feedback on whether you were successful or not.