Fine
The game was a liitle short and most levels were easy, some even had shortcuts(like lvl17) deliberate or not. Only one level (15) was hard, which required me to do some calculating.
Maybe you should consider making a level editor, one that will generate codes after you solve it(which you can share here). As said below a timer could be nice addition. A leaderboard is not needed since it would be full of fastest 'second time' scores. However some references scored would be nice.
great game
nice game but the reason for the 8/10 is because its a little too easy but other then that it is a great game so addicting hehe
Sweet game
Nice concept and nice levels. The game looks proffessional and the levels are gradually getting harder. But then on some of the few last stages it gets easier again, why?
As Tage7 said, add some prize to the game for completing the game, a few new stages or another game mode, not some cheap pictures.
Something that might make it look better is if you add borders (hope you know what I mean).
Try to make it more original so it sticks out from the rest of the endless puzzle games. There are a lot of puzzle games that have different concepts, but they are similar in style in a way. Sorry I can't say what to do to make it original. I'm sure you'll come up with something :P
Simple yet addictive
True, the music is repetitive, puzzles are easy, but I still love that game!
Quite enjoyable.
Unique
Very interesting game. increased difficulty around level 9 was nice.