This is a very strong entree. I love the puzzle design and this game very much to my liking. Would love to buy a game like this.
One of the things I love most about this is how natural the game feels. New mechanics are introduced in a natural way without having to explicitly tell the player how they work. A brilliant way of letting the player figure it out for themselves.
What I would like is a setting that remembers your input between failing. Especially on the longer levels it makes it hard to remember what you exactly tried.