I’ll elaborate on this.
What are the things that are made?
The Egyptians army men
The insects, animals, nature involved in the plague
How did these creations understand God’s power?
Towards fulfilling God’s purpose…
You (king) keep my people under bondage, you pay for it!
Insects, animals, I have created you for my pleasure, and my pleasure is that you do your part to help my people.
The sea (the nature), you need to give way for my people, obey my command.
Cause His people needed to witness God’s power and thereby know God to fulfill God’s purpose.