This game is awesome, a very good puzzle game.
I found myself easily immersed, I spent half an hour all together without even realizing it. That is extremely uncommon.
The music is nice, a bit bland and the loop gets tiresome after a while (like 20 minutes, but most songs would) but it didn't take me out of the game's fun. It didn't distract me, it was the perfect volume and actually helped me become immersed into the puzzles
The graphics are simple, and clean looking, with my only problem being that sometimes you'd have to re-drag the pieces into the green spacing, but that's me nitpicking.
The puzzles got harder over time, with even the most simple looking ones taking time to finish, however level 50 which I would've liked to be climatic with a really hard puzzle, wasn't. It was extremely easy in comparison to the previous 10 levels, however, in it's own way it's nice, because after all those hard puzzles, to end on something somewhat easy wasn't too bad. Though I would've preferred if it were harder.
Very simple play style, and the originality isn't the best (I believe I've seen similar games) but it was really well executed and the music really was used well. Thanks for the awesome game.