Taking the “rhythm” and “runner” out of “rhythm runner”...
The Bit Trip series originally delivered on the promise of rhythm-based games that had you actually making the music by whatever gameplay the particular game had. Every jump you made or bit you reflected back was on the beat and helped to create the music of the level.

Runner 2 did something interesting in that it was the 3D evolution of Bit.Trip Runner. It still maintained the rhythm elements (though not as strictly) but it was fun and different. I 100%’d that game.

Runner3 not only further steps away from the rhythm elements (really the game hardly feels like a rhythm platformer anymore) but it also takes a step away from the “runner” elements by introducing horribly-controlled vehicles and atrocious boss fights.
And none of that is to the rhythm anymore. The only rhythm/music-creating element that still remains in the game is a blip when you collect the gold and even that doesn’t work correctly. Often times the sound is delayed. Other times it doesn’t even happen.

This game is all-around a disappointment. Quit in World 2.