Love the style! This is one of those simple designs that feels obvious, but no one's done it before. I could certainly see this as a full game, with the ability to upgrade/change dice, or swap out skills for different symbol combinations you need to roll.
My only complaint is that most "Yahtzee" games has you clicking to lock dice, not reroll them. It's counter-intuitive, since "unclicked" dice are all rerolled until you click them. Then only "clicked" dice are. The little light under each die changes meaning.
But besides that, I love it! Great polish for a game jam game. :)