Just from playing with myself by just switching the controllers I used every once and a while I can say this seems like it would be a fun multiplayer game. 4 player support would also make it more fun in my opinion. Another thing that would help would be keyboard support as the controls aren't that complicated. I will say switching between the A and the X button to pick up and throw was pretty annoying especially considering that you can't pick up multiple items from what I can tell. It seems like you have a foundation for a good multiplayer experience and I wish you best of luck if you decided to pursue this idea further as I can see it being expanded in to an incredibly fun multiplayer experience.