Nothing much to add except, well, wow. You've clearly put a ton of work into making this great and fast. Random directions you could take this: level editor, in

Nothing much to add except, well, wow. You've clearly put a ton of work into making this great and fast. Random directions you could take this: level editor, interior design room layout, pop-up-book creator etc. The key is to get the UI right, which is a Hard Thing when it comes to translating 2D movements into 3D space.