This is a simple game called "Sonic Galaxy". The game is implemented as a single HTML file enclosed in script tags. It uses JavaScript to handle user input, update the game state, and draw the game on a canvas element.
The game can be played on a smartphone. The player controls Sonic using the arrow keys. Sonic can move left, right, up, and down on the canvas. The game uses a pictogram of Sonic for visualization purposes.
The game starts by loading the necessary resources, such as the pictogram image of Sonic. Once the resources are loaded, the `startGame` function is called to register event listeners for user input and start the game loop.
Inside the game loop (`update` function), the canvas is cleared, and Sonic is drawn at his current position on the canvas using the `drawImage` method. The game loop then requests the next animation frame using `requestAnimationFrame`, creating a smooth animation.
To play the game, simply copy the code into a .html file, save it, and open it in a web browser that supports JavaScript and HTML5 canvas. You should be able to control Sonic using the arrow keys on your smartphone screen.