It could be. Right now though it's so combat-focused that the only two modes I can think of being fun would be:
1. A wave-based cooperative survival mode, with finite juice and upgrades in a dedicated alternate environment; and
2. A competitive fighting mode, particularly weapon-only. I have occasionally accidentally parried Mrs. Slitherss' Dragin-buster, and once even pushed it right back into her causing her to hurt herself, so I know swordplay is possible in Juice Galaxy's peculiar physics system.
I have to imagine this competitive mode would be weapon-only; some grimoires are so powerful that in a competitive mode they'd win hands-down and be very little fun to play against.