I really like the concept of what you have going on - but, I started off with no idea and have been randomly pressing buttons. A couple of playthroughs later and I think I've grasped the idea. It could do with some extra feedback to help player's figure out what is a good and bad decision to make and a way to scroll around without having to zoom in and out would be useful to add too. I think you have a strong idea for the sort of game I would love to play - with a little tutorial to start and some extra audio/visual feedback, I think you'd have an excellent game!