Was fun! Simplistic and nice looking graphics, except the UI but I grew to overlook it as soon as I got engaged in the gameplay (after first level) :P
Getting 3 stars was super hard on most levels. I would have loved it if there was a 'pattern' I could learn/figure out that could eventually benefit me score better in the next levels, but I had to bruteforce combinations at every level to get the correct one, and even then I wouldn't understand how come it's the correct one :p
Also, I think the 2 stars should be like, much easier to get.. not even sure there's a way to get it without just moving once or twice then moving right back to do the 'correct' solution.
Overall super enjoyable, though!
I had fun figuring out the puzzles and checking for the correct solutions!