Thank you for making this. I've played a ton of picross games, and I've never seen one that makes you submit the puzzle when you think you're done. At first I wasn't sure what to make of it, but I actually like the idea a lot. The no punishments or indications of when you hit a wrong square is only figured out by your own merits when you correctly/incorrectly submit it at the end.
I also really like the story, good stuff.
My only critique is the controls are a little slidey in the puzzles.