This game has the most puzzling balance issues in that it is heaviiy RNG reliant, but what is randomized is mostly actions that in other genres are in your control. Unlocking rooms might place them in a useful space or somewhere out of the way. You might get lucky and have a brickmaker + engineer goblin right off the bat or waste hundreds of turns without either or both. The shop might give you useful items/upgrades or a bunch of minions with no beds. Traps you buy might get placed somewhere useful like in a chokepoint or in a random corner where they will never trigger, and so on and so forth.
That and one of my runs was killed from finding the first 2 orbs right at once, but the third being so out of the way even with prospectors and torches I couldn't get it before getting bored of having to fight yet another 10+ heroes wave.