Gameplay of the game called "vivid/stasis".
Some in-game terminology to help you understand what's happening
Opening, Middle, Ending, Encore - Difficulty names.
Decryption type - Additional option to make gameplay even more difficult:
Ultimate - One miss K.O. decryption type. Yields more rewards, the most risky
Harmony - Yields x4 on both Battery and Performance (in-game currencies). Notably strict health bar
Charge - x4 on Battery, x1 on Performance points, less strict compared to Harmony
Performance - x4 on Performance, x1 on Battery points, Equal to Charge in life bar properties
Basic - x2 on both currencies, no health bar.
I also try to show all the note sound types, all settings, and what happens when life bar depletes.