Because your area is so small, @AkumaRai, 16x16 tiles, you could make a much simpler version that writes numbers to an array that matches the screen-size like this:

fieldsnake

by dw817

Cart #fieldsnake-1 | 2022-11-15 | Code ▽ | Embed ▽ | License: CC4-BY-NC-SA

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For a robust SNAKE that uses the true 128x128 pixels of the screen, I offer you this:

Both are chock full of helpful information and remarks.

https://www.lexaloffle.com/bbs/?tid=48506