Fixed now. you can playing both windows mode and fullscreen mode !
And Add Exit Button. you can see button at option
But, i dont recommend playing On PC.
Unity is dont supported PC resolution`s 9:16 or 10:16
so you can see side white or blue image.
that`s i can`t fixed. just engine`s bug.
It would be possible if it was a self-developed engine.
But i Using Unity Engine. maybe if Change DirectX engine, that`s Fixed.
But There is no plan to change the engines.
Self-developed engines need cost and time too much.