Neat puzzle game concept with pleasant and thematically consistent graphics. One criticism: I think having limited lives is a bad fit for it cause on the more complex levels you're bound to have a bit of trial and error and going back to the beginning is no fun. Because of the tile based movements it's also easy to misstep, so allowing to undo a single step would also be great for this, imo. (Not sure if any NES games have something like this, but Boxxle and Catrap on Game Boy do.)