So far I've been lucky enough to clear lvls 1,2,4 in under 10 runs (9,6,9 respectively) lvl 3 is 11 runs and counting. funny thing is every run that gave me my final drop I lost a unit, but, lvl 3 I kill the golem every time and don't lose units and can't get the damn tin can to drop.
maybe I should give it a sacrifice (if I could only find a virgin in my army )