This is a really nice puzzle game, with some particularly adorable art.
Only issues, if any - are that it's a little slow to get going moving (particularly with those first very easy puzzles, moving to the right takes a bit longer than it should). Moving diagonally also feels a bit odd on keyboard, but I'm not sure you can get around that, with the puzzles being hexagon-based!
You've designed plenty of really thoughtful puzzles, and a well-timed hint system. Great stuff!