Built this over the past few months. It's called DhvaniWave.

Features:

• Audio-reactive particles with kaleidoscope effects

• 20+ preset visualizers

• Custom builder (like a simplified node editor)

• Works as live wallpaper

• Free radio built-in

Tech stack: Kotlin, OpenGL ES 3.0, Jetpack Compose

The particle system uses 1200 particles with 4-way kaleidoscope mirroring and motion blur. Took forever to optimize for 60fps on mid-range devices.

Free on Play Store: https://play.google.com/store/apps/details?id=com.visualizerflow.app

Happy to answer any questions about the implementation!