Beat evolved.
http://www.nintendoworldreport.com/impressions/24686
The final game in the series looks to be a fitting ending. Only so much can be seen in the first area, the part I've played so far, and there is definitely more to come in the other stages.
Flux plays very much like Bit.Trip Beat, with the same control scheme. The game is basically mirrored, with the paddle is on the right of the screen and the dots fly from the left. The squares to hit are now all the same color, and there is more speed variation. Bonus squares are colored grey, and difficult to collect requiring really fast movement since they are placed far away from where your paddle should be next.
The three areas are now subdivided into levels within, with checkpoints after each one. The first area is called Epiphany. When you die, you return to the last level that you passed with a few points taken off your score. It seems that you have unlimited continues. Even with checkpoints, the game is no easier; it keeps throwing things at you and you're constantly racing to move into the right spot. It does make it less repetitive, as you are no longer playing sections that take several minutes over and over due to being stuck in one spot, but you are also more likely to be stuck in the same spot time after time due to the increased complexity.
Circles have been added that are to be avoided, and they can be laid out in rows or just in front or behind a square that you need to return. Adding dodging gives you exactly twice as much to do. At one point in the level you are forced to take the power-up that shrinks your paddle, as you need to fit through the gap between the line of circles coming at you, whereas in the past, you could have skipped the power-up and the bonus for completing that section.
Flux is still all about patterns and music. The beat matches perfectly with the timing of the paddle. As this time, the speed of the squares is more varied, it's closer to playing the melody of the track than the rhythm. The backgrounds change as you move up the ranks as before, and there are more modes than the three from Beat. The black and white Nether mode only makes a sound if you miss a hit, but moving backgrounds have been added.
On the surface, it's Bit.Trip Beat evolved, but the more you play, the more you see that it has elements from all the other Bit.Trip games that add to the gameplay of Beat. I've barely started; there is much more content to be seen here.