Could creatures be free in a world with deterministic laws? Yes, because God could work a miracle each time that it is time for a creature to make a decision, a miracle that exempts the choice from the deterministic laws. So, cheaply, free will and deterministic laws are compatible.
This is obviously too cheap, so probably we had better not define compatibilism as the possibility of creaturely freedom in a world with deterministic laws.
Though, maybe, we could stick to that definition of compatibilism (at least in respect of this problem—there are other problems with it), but insist that if God exists, no law can count as deterministic, because God can override every law.