So, either the average solving times are wrong, or I'm a genius, because I'm more often than not way below the average completion time of the puzzles. Either way, picross always gets me addicted. This is not the best picross game I've ever played, but it's way up there.
The graphics are as simple as they have to be, and they are not unappealing. Given that Picross is such a simple game, I'd love to be able to customize the game's appearance (such as in, say, Pixelo), because all that blue eventually bores me. Also, the music is good, but there's only one song, and it eventually gets old. I usually just mute the music and continue playing.
The gameplay is, well, Picross. You get a matrix and indications in the rows/colums that tell you the length of the pixel segments contained in said row/column, and you must use that information to draw the image. There's the option to mark squares with an X, which is very useful, and that's about it.
The controls and user interface are what annoyed me the most in this game, seriously. Sometimes, you just move your mouse a little bit out of the line you're drawing, and that results in drawing over squares you didn't intend to, and losing lives. I like Pixelo better because it contains quick keyboard controls which eliminate this problem. Also, as if it weren't bad enough that the mouse doesn't fixate on the line you're drawing, you don't even get a highlight of the line/column the mouse is pointing at, and that's an even bigger annoyance, especially in the larger levels.
So yeah, given that Picross is such a piss simple concept, you sure could have dedicated more to making the controls less annoying to use.