Wow! This is an amazing jam entry. I love picross, so I just played through all the puzzles in one go. (Loved the secret one!) It was a lot of fun.
The only gripe I have is that hold+dragging the Xs cancels any that are already placed, which forced me to slow down a bit. But that's a small nitpick!
It was a great idea to have helper characters that help you out with their special abilities. All the characters were so cute and funny. And I really love the idea of picross with a storyline.
You should be proud of your accomplishment. Thanks for making such a swell game for all of us to enjoy!