Meh
I've played more addicting games, but I think to make it better you need: sound, music, and more room to move the mouse. Have an option to mute the sound as well. I recommend playing the game "Particles" (it's on Newgrounds). Make improvements like those you see on that game, you'll get a better score from the viewers, and it will most likely get more addicting. The shapes also seem to have a set path in where they go, which means you need to mix it up a bit. Make it more random. Aside from that good job.