Completed Goldrust with only 26000 points
Windows 7 64bit
Nvidia GTX 750 Ti
Got a victory screen after amassing 26000-27000 points despite Goldrust requiring at least 75000 points to be completed.
It should be noteworthy that I tossed 3 level 5 heroes into my dungeon and got the completed screen after they were killed. I also did NOT get the Working-Class Hero achievement.