<!DOCTYPE html>
<html>
<head>
<title>Змейка</title>
<style>
html,
body {
height: 100%;
margin: 0;
}
body {
background: black;
display: flex;
align-items: center;
justify-content: center;
}
canvas {
border: 1px solid white;
}
</style>
</head>
<body>
<canvas width="400" height="400" id="game"></canvas>
<script>
var canvas = document.getElementById('game');
var context = canvas.getContext('2d');
var grid = 16;
var count = 0;
var snake = {
// Начальные координаты
x: 160,
y: 160
dx: grid, <-----------------------------ВОТ ТУТ ОШИБКА
dy: 0,
cells: [],
maxCells: 4
};