Not a bad game. It should remember that you've entered a password because typing on a touch screen isn't fun when you can't see what you're entering. Hope to see more from you!
I love these types of games. My only problem was the controls. Maybe you can make the zoom and move buttons bigger, move the buttons somewhere else, and offer drag to move. The drag to move alone would be huge for touch devices. Pinch to zoom may be a bit harder, but just as awesome. Keep it up!