Fun game and very nice visuals, especially the illustrations on the cards.
I thought the gameplay was challenging, but it was a definately not too hard when I got the hang of it.
I did not use the sacrifice function at all on the run where I won. It seemed to me that the effects of playing the cards that you could sacrifice was just as good, if not better, as the effects of sacrificing them, especially the donut.
Overall a fun game, nice job!