Lucky for me I was familiar with the goal as this is a game done with rings as well; so I was able to complete the game quickly.  Good idea for a 1-min game jam.

The pink pumpkin does disappear on middle and right spool.  It's still there and you can move it back to the first spool to see it again, but for some reason the sprite is hidden on any other location.

A simple outline of your goal would help direct people what to do.  Something like this

I don't quite get this game. I tried to rearrange the pumpkins. In the end, the green one was halfway up the pole, the pink one had randomly disappeared, and my orange and blue pumpkins were just sitting there. (which actually was kindof interesting)

I don't exactly get the point of this game, sadly. Also, I didn't notice the one-minute theme part of the jam. I played for much longer than a minute, and nothing happened. The pumpkins would occasionally be unable to move. It took about five tries to move the green pumpkin. Overall, it needs some explanation on the point of the game and the rules.