Fair warning for those sensitive, there’s at least a few levels after the game introduces the purple tiles which don’t become solid until you crossed them twice where the solution could contain an embedded swastika.
The tight quarters of the top-right island in level 24 in particular I don’t think can be solved without creating that shape. Gave me a real start when I saw it.
To be clear, I’m otherwise enjoying the puzzles and I don’t think this is at all intentional. But it is an oversight when the mechanics and level design lead the player to create a hate symbol for no greater purpose than satisfying geometric constraints.