Kevin Grant, Developer of “Celtreos”

See gameplay for “Celtreos”, a shmup/shoot-em-up for iOS/tvOS on the App Store and macOS on Steam.  This game has an amazing 30-song soundtrack (over 45 minutes of music!), tons of stages, and plenty of customization options.

Try before you buy by looking for the free Mac demo on Steam, or on mobile by getting the cheaper “Celtreos Lite” and later completing the bundle if you want the full game.  The game soundtrack is also available separately on Steam.