I guess I play it mostly casual, so circles are my thing. Though I wasn't even aware you could rotate shapes. Also, what I meant by the merging and popping out, is that you merge two shapes and then another smaller shapes jumps up due to it and out of the box. But regarding the game over state, I prefer the suikas where you only lose when an orb drops outside of the box instead of over the line, but that's a minor thing and a personal preference.