What a treat of a game! You have a knack for creating puzzles. I liked everything about this little game: the puzzles, the aesthetics, and the simple but fitting storyline.
If I have one quibble, it's again the controls: if the whole gameplay revolves around dragging objects with the mouse, then the restart button should also be clickable and not force the player to switch to the keyboard. But that's a minor point that didn't spoil the enjoyment at all.