Shapist

Do you remember this child game? If not, it's a great opportunity to remember it.
The game is made quite simple. Several colorful primitive pieces are located in designated area, to solve the puzzle you need to place them at a such way to make the gray area empty, without single piece.

Also, the game has a specific shapes. One of them can be compressed up to 1-2 units (depending on the form), another is a common square, that if be connected with the same one or more of these squares, will be united in a one shape. They can be separated at any time.
The earliest levels seem easy, but with each successive level everything becomes more and more difficult. In the end of the game the latest levels can be passed only by the one or those who have well-developed thinking, as it is simply unreal to go through it for a common man.

There is no punishment in the game. There is no training and help, which indicates how to do that. There is no time limits.
Unfortunately, not all of the levels in this puzzle are available immediately, some of them are paid, but it's worth it.

This puzzle was found the best in Indie Prize Amsterdam in 2014, and it's really deserves this win, because it has everything needed, for example challenging levels, a decent art style and minimalist design.