Because objects of abstract level dont need jpg textures, you must set them emission in code. They must looks like on attachment screen. That means they must glows because we not use hdri map on this lvl. For create snake you need use 2 elements
SnakePattern_head.obj - this is model was a head of snake that should be in front of the snake as in the screenshot
SnakePattern_Body.obj - this is snake body, when you load this element in lvl you see this is one square pattern, you need to build a snake body with this pattern, use array of this elements for creating the snake body as the attached screenshot.
Because objects of abstract level dont need jpg textures, you must set them emission in code. They must looks like on attachment screen. That means they must glows because we not use hdri map on this lvl. For create snake you need use 2 elements