Create a snake for a main character 4k remake of an old game (snake nibble)

(THIS IS A 3D CHARACTER, ANIMATED FOR UNITY (LOW POLY)) Create a snake for a main character 4k remake of an old game (snake nibble). I need this snake asset to be compatible with Unity 2018.3.14 Look similar (cute) with the old snake found on this video: [login to view URL] The graphics will be 2d and will look from above. I attach one round (forest). The 3d snake should move in a hidden grid and the snake should never go outside the grid. Snake asset should be animated for Unity 3d. 1) Crawl - move (with snake body, head and tail inside the grid.) 2) Turn left or right. (with snake body, head and tail inside the grid.) 3) Move eyes, move tongue. 4) Open close mouth to eat objects like apples. 5) Crash the head to an obstacle. 6) IMPORTANT: Become larger (by one snake box grid at the time) or smaller. This happens if you eat one apple. This is critical.