Here is a winter edition of a strategy game, called Civilizations Wars! You should drag your mouse from your buildings to the ones, which belong to your enemy, to attack them. You can also drag the mouse to your buildings if you want to reallocate your forces. Towers don't generate people, but they are used for the defense or increasing the force of your units. You can also use spells, which you can buy by spending your crystals. Good luck!