What a cute little game. I just finished it in around 6h on my Miyoo Mini Plus.
I love the idea of the museum and the overworld, I just wish the actual picross engine would be more fleshed out, especially when compared to Mario's Picross. Some grid lines or acoustic feedback would go a long way, maybe even crossed-out numbers.
I'm looking forward to the sequel, or any other objetdiscret games for that matter :)
Now on to the long gallery...