Thank you for playing!
Yea the Star Grid tile has that sneaky 6th tile! Also you can press "I" when on the puzzle to view its solution, also when you solve the puzzle the door opens and it closes the puzzle.
The soup stirring can be like that, I'm not sure what the exact problem you faced was but its likely that the mouse movement wasn't detected in the region it was supposed to be stirred. If you want to try it again, you could try stirring it then let go of the left click, stir it, and repeat.
Thank you once again for playing!