I believe I stumbled upon a favourite! A gorgeous little game, I was instantly hooked, but no matter how much I tried I could not beat level 3. :< The artstyle is perfect and the puzzle is great - at first I wished for some sort of indication of where tiles would be best placed to get as much of their values as possible, but after a few tries I believe I had a good grasp of what should be where and it wasn't much of an issue. :)
I think that what got me in the end was the inability to do some sort of planning before putting out the tiles. I only agree somewhat to the other comments about being able to take back a tile - perhaps that would make the game too easy, but it would still not be less of a puzzle and alltough more easy it could fit a relaxing game such as this. What I would've like to see instead would be a small representation of the tile layout, perhaps on their icons, because at the moment I had to remember every layout and that became very hard as levels increased. Like, it would be nice to have an overview to see if this particular block had a square-shape, an L-shape or similar. I think that would add a lot.
But other than that, this was a really beautiful idea, very well done!