Some of our games have iMessage stickers! You can send these in the message app and you should see the little icons for any iMessage stickers you have in the toolbar above your keyboard, although you may need to tap the little appstore icon by the camera.
If you can't see our game here scroll until you see the button with 3 dots and select this, here you can choose "edit" and turn off/on iMessage stickers for certain apps.