It's sounds like you've got your hands full until December. I look forward to seeing more of development. I didn't mention it yet, but I love the little details like the lily pads and water splash animations. I hope there's more things like that in the final product. 
Well, as you pointed. I followed the way Mekarama and obviously Monument Valley.
I am trying to make the screen looks even more clean and clear, and make the puzzle map grand scale, and most importantly give the fun of creating back to the players.
I am working on the combination of colors and different building styles now.
Hope i can finish the 1st version of the game before Xmas.
It does look like Mekorama now that you say puzzle builder. I'm sure it will be fun! 
Thank u for your kind word, and it is for a game, a maze builder type. I am still working on it.
This is so nice and clean. It has a very "crossy road" feel about it. Is it for a game, by chance?
Thank u, and your comment will always be appreciated.