I like the game mechanic. It is not as easy to 'get' as the most successfull franchises out there which may be a bit of a hurdle for a portion of the casual gamer public. It could be that they will put it aside or think it is 'just like that other game' you did earlier while is clearly is quite different of you spend some time on it.

I am not a professional when it comes to video game marketing but a lot of people people do seem to want fancy graphics and sound effects in a game and are off put if that is not catered for. They judge a game in the app store by the few screenshots that you are able to put in.

It is a tough market out there. I would love to give you some playback feedback if you'd like.