Minimalisic snake game for Vim learners: instead of using arrows you have to use h,j,k,l for navigating. If you use vimium plugin, make sure that it is disabled on this page.
Navigation: [h] left, [j] down, [k] up, [l] right
Speed: [-] slower, [0] reset speed, [+] faster
A slightly more advanced version can be found on vimsnake.com. There, the snake can change directions and eat food only in insert mode.