Merged comes to mind.
The number 1 drops down after every rotation (move) that you make. 1's merge into a 2, 2's get merged into a 3 etc.
This is a decent game, not great; a Leaderboard feature would make things more interesting. I've played it 5 or 6 times and the highest tile I got was an 8. By mistake, I rotated right instead of left. And that totally made me lose.
I'm curious about how this game would play with a 4x4 grid and if random #s dropped down instead of just 1's.
I like the graphics. 1 tweak to improve: tapping on the right/left sides of the screen as opposed to just tapping on the curved arrows.