Control your orb and make it hit the space enemy. Use the arrow keys or the mouse to aim towards the enemy and move the orb in the direction to hit the target. The target will be destroyed immediately. You can make multiple kills by quickly taking out several enemies as quickly as possible. For that you will have to make your orb to jump instantly form enemy to enemy. This will help you to increase your score significantly. When you max out an attribute, you will unlock a special upgrade every time. Collect several crystals to earn more points. Killing some special enemies gives you an upgrade as well.