Prepare your defense against the oncoming waves of creeps. Don't let them complete the path. Do that by building your base that consists of defense towers along the way.
Every human own billons of nanoscopic cells.
Some of these cells are doomed to protect our organism and fight foreign organisms. Use your cell colones to slowly progress and take over the map.
Instead of building towers and defending against hordes of monsters, play the opposite as an evil mage that builds his army from the ground up to dominate the lands.
Help the space rebellions to drive the evil spacelord out of the Minoria system. Deploy, defend and attack their solar systems to take control of the galaxy.
Build structures, train army, destroy enemy castles. Your soldiers will charge and break through enemy defense lines automatically and use magic to assist your corps assaults.