How to flip my tilemap with enemies and objects but the character?

Question

When you press certain button, the map is flipped vertical or horizontally with all the entities but the main character.
How i could do that? And also make the character always be in top of the nearest tile to stand (because the ceiling becomes the floor and viceversa if flipped vertically)

Answer 1

A) In case your character needs to be nested into tilemap, flip both character and tilemap to visually flip tilemap only
B) Use scale.y = -1 * zoom to flip whole tilemap (and/or character)
C) I see no future issues with gravity if flipped this way (presuming you are using move_and_slide())