I really liked the concept of this game. Looking for different combinations in each round really gave it some variety.
The first couple of rounds felt a bit too restrictive; it was basically just rolling and hoping you get exactly what you need. The last few rounds were a lot more interesting -- letting you decide which numbers you want to gamble with. Though it feels like the lack of further interaction made it less fun; if you e.g. took an attack every time you rerolled, but the round goal and locked dice stayed the same, it would have removed the "unwinnable" feeling that bad luck gets you.
Anyway, a clever use of the dice; well done!