I personally agree with this. I understand that Juice Galaxy is supposed to be psychedelic and surreal, but I also took a liking to some of the less unrealistic textures and objects in the game; the grass is no exception. The generally green color of it made it seem more conducive to suspension of disbelief.
Also, I want to add here that having relatively real-ish looking colors and textures on some objects and ground, helps make it stand out much, much more, and be more gratifying, when you get to a particularly surreal place, like in Heck, or when you fly back to school only now with the power to defend yourself. To say nothing of additional planets or even whole worlds which may come along.
