Ask HN: What do you think of my new iPhone/iPod touch game?
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You need some kind of natural progression in the demo so people can understand it more. Maybe start with only a few shapes. This could go for the game as well.
This game is not as easy to understand as like bejeweled or Tetris but I can see where you are coming from. The real thrill in those games are being able to set up a large chain.
What makes a game like this fun (and actually most games) are upgrades and level ups. Try having things you can put points into. First thing that comes to mind is special "attacks" or cubes. Maybe a cube that affects two levels of cubes instead of just the same size.
I meant shape as in size! Clearly it's not about shapes as they are all square. My English gets poor right around time for food.