Lord of Dwarves has a simple gameplay core. Build any structure in a custom 3D world. Then use that structure to defend against hoards of invading monsters.
This video shows the first level of the campaign which gives a taste of the core gameplay in Lord of Dwarves. Level 1 sets you up with a nearly complete castle and a few squads of armed dwarves. You have to defend the castle against a number of orc invasions while at the same time finishing the construction of your castle to make it even more defendable.
Construct walls, raise ladders, set traps, order troops, and more as the first level gives you a taste of what Lord of Dwarves has in store.