Ahhhh, yes, it probably is 5 seconds. It just feels shorter than that. :D
Yes, I'm playing on-device.
Another important piece of feedback: I played again for a few minutes, and a few times I did complete a level or three, but as far as I could tell, the score was not shown anywhere after completion. I think you should definitely add it (and maybe also number of levels completed) to the screen that asks if you want to replay.
Of course additionally it would be nice to save the highest score and display that on the home screen or somewhere.