You'll create different types of rooms to satisfy the needs of your creature inhabitants. For example, you'll need bedrooms and dining rooms to attract goblins, but later on you'll also want to create recreational rooms, torture dungeons, and libraries to attract new types of creatures.
In addition to the rooms created for your creatures, you can build different types of traps and decorations for the dungeon. This helps you personalize your lair for your creatures, who you need to motivate to fight on your side. In fact, if you can't keep them happy, they may abandon you at any time.
Dwelvers stands out graphically. Considering it's an independent game, its three-dimensional models are quite impressive, and it has an attractive look in general.
Dwelvers is a great strategy game that takes all the best from the classic Dungeon Keeper, with none of its downsides (which, to be fair, it didn't have in the first place).