Interesting game and idea. I did not understand in the beginning what the cards are about (how they change the game). Only when I was already in round 5 and hovered over these I saw there usage.
Furthermore I did not understand why cards disappeared in a round sometimes (not clear to me). And at the end when I had 6 dice left and rolled 3 and did not reach the sum the game ended directly having still 3 dice left, not sure if it was already calculated if I would reach the score for next round or if it might be a bug.
Also the pixel style of some numbers is quite difficult to read sometimes (for the dice I got used to it when playing).
But overall a nice game idea and implementation.