Smallish update to the beta build.

Primarily includes typo and grammar fixes, but additionally includes a couple new CGs for late in the story, some changes to the "Oasis" CG, a pass on the UI to make it all a bit more coherent, and some additional art by RUBYFUNKEY for the scene with KK. Oh, and I reworked how the sprite layers are named so I have a bit more flexibility with them in the future.

Enjoy~!