ROOTS'S PROFILE

I don't disagree with your comment. In this particular case, this is a pretty "empty" battle scene because there's only two characters and two small enemies (minimum enemy size is 64x64). The game has a max character part size of four and has a ton of space for large groups of enemies (or a single large enemy), so try to imagine the same space when it's filled to capacity.

Take a look at this early boss battle, for instance. With 3 characters and one large enemy, the space doesn't feel so empty.
https://youtu.be/2EX9K1kCF0M?t=10m24s