Interesting design choice, but I think I would enjoy it more if there was no dice limit. Maybe you could simply remove the oldest dice when too many are added.
Some other things: Add a label that shows the highscore when the game is over.
Sometimes the drag and drop fails even though the move should be legal. Doesn't happen too often and mostly in the yellow field.
"I hope you enjoyed it"
I did! And beat the highscore! I like the concept and I hope you expand and polish it after the jam. Good luck!