I love picross, and this is one of the better versions I've found. However, it's really really difficult to see the light grey color. It's also really tricky to keep track of the numbers when they expand into the drawing, because they become difficult to read. I keep messing up because of the format of the game, not because I'm not good at picross, which is a little frustrating.
I'm really enjoying the game a lot. There's a lot of humor to it that's just a lot of fun. The only thing I'd really like to see is all the daily quests displayed in a separate tab from the rest of the quests, so you can see what you're really working on, and look at the daily quests only when you feel like doing them.