Nice little game, i liked the idea. I didn't uderstand the use of the resizing, but it looks really cool, liked the feedback too!
There is no use. I didn't want to "use" it because it wouldn't be much of a 1D game if I did. But I thought "you have a 2D space though, why not do something cosmetic with it", so I made it so the player can make the game look a bit like he wants.