I love dungeon builders. The possibilities with the room placement and orientation make it a fun puzzle trying to figure out the best arrangement. I like the game, though as you've mentioned getting through the dungeon is too luck based. Maybe try tightening the random range (e.g. 0.5 the stat value to 1.5 the stat value or something like that), or make the permanent bonuses larger and more common?
Also I don't know if anyone else had this issue but when I tried to rotate the room with my mouse wheel it went spinning like crazy.