Worthy are You: This phrase is never used for God in the Old Testament. However, people in Rome often used it when they worshiped the emperor. In Revelation, it is clear that only God deserves worship.
You created all things: Many people in the ancient world believed their gods were too busy to care about humans. But God is Almighty in a real and active way. He created all things and continues to rule as Creator and Lord. In Revelation, creation shows that God is in complete control of the world (see Revelation 3:14; 10:6; 14:7; 21:1).
by Your will they exist and were created: God had a purpose for everything he made.