"Simply merge balls into one." Not complex at all ;)
Nice game, fits the theme well. Adjustable difficulty would be a cool feature, but I imagine if you added more levels it could be scaled without it.
Thanks. Wasn't sure how to scale the levels to be linear in difficulty, 1-2 are easy, 3 is ok, and 4-5 due to time limit are hard. If I had spent more time on levels maybe I could have smoothed it out more.