PLAY IN TURBOWARP IF YOU WANT YOUR COMPUTER TO LIVE. Not really, but it literally will not run in Scratch. So play it at https://turbowarp.org/#431241407 for a better experience. Also use turbo mode. Play with WASD Press "C" to render a high-res image of your current position (warning: this will make even turbowarp lag momentarily. Just be patient).
Thanks to @Raihan142857 for the raymarching tutorial, which I attempted to make real-time with player movement. I can't figure out how to make turning controls, i.e. looking up/down, left/right.