mdsahabul/wifi-runner ? reverse-engineered prompt

Build me a simple endless runner browser game called Wifi Runner using plain HTML, CSS, and JavaScript.

I want it to feel like a fun lightweight web game that runs right in the browser, with a player character that keeps moving forward, obstacles to jump over or avoid, and a score that goes up the longer I survive. Please make it responsive so it works on desktop and mobile, and keep the visuals clean and playful. Include basic start, restart, and game over behavior, plus simple controls that are easy to understand.

Keep everything in one small project with an index page, styles, and game logic, and make sure the game is actually playable without any extra setup. If you need to check any current browser behavior or best practices, look it up online.