We are super happy to know that PenguinVania is her favorite and she spent a good time on it! We put a lot of effort into the polish because we think that's important.
Actually the penguins and a bunch of monsters are our signature, you can see them in different other games we made: Shiro's Dungeon, Path of Click and Final Party are only a few of them, all made with Ruby/Gosu too!
Thank you very much to you and your daughter for the positive review, it's really motivating!