Hi, this is very nice and interesting game. I really like the mechanics. Also the amount and quality of puzzles is great.
I found some puzzles really hard and I was not able to solve some of them. I would consider this as positive aspect in later levels, but this should not happen, when the new mechanic is introduced. These first levels should be as simple and as straight forward as possible.
Also adding some "picture tutorial" for individual mechanics would help to get going faster. I was sometimes confused at the beginnig, how the mechanics work or what am I able or not able to do.