Clickfort island

By clicking with left mouse key on any of the buildings on the UI you can select to build that construction in any empty spot on the land(also by the same key), pressing "Esc" will set the action to gathering, where clicking on trees or stone will collect them and clicking on the main castle will collect resources from all the available farms and mines. Choosing the dynamite element in the UI will set the action to destroying, this will make you destroy buildings when pressed on them, refunding 50% of their cost. Lastly there is upgrades in the most right spot of the UI, where you can advance to the other age, unlocking new buildings, which can be seen by pressing the arrows in the left side of the UI.