It's decent, but I wonder if you should be allowed to keep playing the same level over and over in a draw. I was able to get a ton of money this way very early.
Got it on day 6, almost had it on day 5. Planets are the only thing really worth buying. You should change the pricing to either encourage the magnet options to be more worth it, or to discourage just buying planets. Also, a free mode or keep playing after you hit 200 stars would be great.