This is the kind of game that would work perfect in a Mario Party game! I love the idea, the sound effects are really satisfying too, although I only had myself so I found it a little difficult to play.
I think the game would benefit from showing the waves themselves, so that you can see the effect you're having. Having a bit more warning on the vortex would also be nice, perhaps it takes a few seconds to fully grow so that you can see it coming and falling in is your own fault.
Did you consider making the game level-based instead of score-based? Trying to navigate different shaped levels with preset vortexes could be an interesting *spin* on this idea!
...if you'll excuse the pun
(-Joe)