Spend skill points into making the homing missile passive. The damage this will give is massive, especially if you increase the proc rate to the maximum. This also allows you hit "ranged resistance" enemies. You can put a few points other skills as they become available, but always focus on making the homing missile passive. You also have to ensure that the homing missiles fire frequently. To do this, Agility is required. Spend almost all normal skill points into that stat. Use gold to add a little health to your character. When leveling, spend almost all of those stat points into Agility. For stat points earned with gold, spend them evenly between Agility and Stamina. In battle, stay as far away from enemies as possible. The homing missiles will kill them as long as your target is somewhere onscreen. Hold [Fire] and dodging everything. Later in the game, always note the angles in which Parasects can fire to avoid an instant death. Place a turret next to Bosses before they spawn. This will keep any melee-style Boss occupied and allow you to range it with missiles and arrows.