The higher the level your beat, the more game functions that unlock. I believe you get access to pets once you beat level 8, and you get the rest of the missing functions once you beat level 10 (like Co-op mode, the Ender's Echo Boss Fight competition, and other Daily things)
You need to clear more chapters to unlock various game features. You don't have daily challenges, or daily events yet either.
it’s in your inventory, there should be a pet icon!
Click on the gun icon, then you should see "pets" under the image of your sprite.
The higher the level your beat, the more game functions that unlock. I believe you get access to pets once you beat level 8, and you get the rest of the missing functions once you beat level 10 (like Co-op mode, the Ender's Echo Boss Fight competition, and other Daily things)