I'm not very good in 3d/gfx but I'm gonna try to give u some feedback

The first one was really neat. Maybe you could do some cool transition between them. They kinda just cut to each other. Ex: make the white ones transform into the blue waterfall ones.

I don't really like the back center in the second one. If you were trying to make it cave in or something, imo it looks odd.. I know you said it's in early stages but imma give some ideas.

In the beginning when it audio reacts to the right red side you could make it do the cool thing u did in the first one. ( assuming left is treble and right is bass )

Another idea is to add some other kinds of 3D or 2D reaction in the video, so it's more fun to watch.