I have no idea what I am doing.
I put all papers on right side and called it a day.
Dragging paper is little of (I had not have mouse on papers -> been able to move pre-preselected paper).
There is no visual feedback when I can grab sth.
Simple example: mouse hover paper -> mouse icon changes & paper become darker.
Try to do sth to engage user.
That happened:
I dont want to read & skipped all text -> then I found out dragging mech. kinda interesting.
When I sorted all elements on right side nothing happened -> I though not finished game -> closed & blame developers.
After restararting I found playing loop after reading that text.
My advice is give player feeling like he/she is in control.