Do you see the little orangeish pink lines in the tiles? Each tile has a symbol representing one of the elements you can move in the main part of the puzzle, the 3 mimics are represented by the bars, which match their teeth pattern, and the triangle and circle match the golden ring and the first slime's helmet, you need to assemble them in the blue part of the main puzzle according to the corner represented in pink by the tile connected to the element, the yellow mimic should spawn once it's assembled properly.