Really nice work.  I've downloaded the pack to try out in an App I'm working on.  Basically it is a pixel editor for doing little animations on iPhone or iPad.  Still a work in progress, but you might enjoy playing with it when it is out, it will be called Pixel Art Pro if you are interested.  It allows import and of tile maps and export to tile maps or animated gifs and supports layer and frames as well as basic drawing operations etc.  When I come to publish it, it may help to have some good art work for the screen shots on App Store.  Would it be possible to user these characters for the app store screen shots? I'll obviously credit you for the art work on the app store.

Below is a screenshot of the app with one of your characters in it and an animated gif made with it - if they site displays animated gifs submitted in posts? It might just take the first frame?

Regards, Dan