Vocally Ami and Yumi are in fine form, though I suspect there is a little processing. Not a good or bad thing. The delivery is evocative of 70's disco, which is well within their wheelhouse. They show a little more dynamic singing which is good.
Engineering for "The Night Begins To Shine" is good, but there are parts where the synthesizers sound a bit muddled and there are a couple bits where I thought I hear a little fuzzy sounds. There are some neat underlying bits that bounce between the left and right channels. On headphones the track does not fade out as you would think, it actually goes on quietly for a few seconds fading into a synth classical music sound.