Very underrated game, this unique gameplay switching 4k to 5k has made this game one of the best rhythm games I ever played, while it's still lack of features compared to its compeititor (lack of calibration, online is very still barebone, lack of real progression), the game has good original songs and fun charts that will get you engage in the game for a long time.
The problem of the game is also the part that makes the game best, and that is the 4k to 5k playstyle. It is not an easy game for casual players and even a more difficult game for 4k players only, having to familiarize with both keymodes simultaneously can be overwhelming if they have never have experienced with 5k, especially when there are red notes (they function either like FX notes from soundvortex or side track from Djmax).