You need to either not make the mouse be hidden, or have crossheirs to show where the mouse is. How it is now, it's hard to prevent the mouse from coming out of the game area.

I definitely agree with swak, you should give it a plotline, or atleast some good images that mean something. Also, you should add powerups, fake blocks, score givers, etc to make it more interesting. At the moment it's quite boring.

~Ork.