The game got too tedious to play by hand, so I wrote a script to play it automatically. It handles CPU, I/O, and processes quite well - but doesn't recognize a crown on a process and doesn't handle memory management at all.

I found that even on the easy level, the number of processes keeps growing slowly, and there isn't enough CPU time to keep all processes satisfied. I feel like the game is inherently setting you up for failure. Here is the script if anyone wants to play with it:

  // ==UserScript==
  // @name     Auto-play "You're the OS!" game
  // @include  https://plbrault.github.io/youre-the-os/
  // ==/UserScript==

  (async function() {
      const IO_EVENTS = {x: 160, y: 25};
      const CPUS = 4;
      const CPU1 = {x: 50+46, y: 50+42};
      const SQUARE = {w: 64+5, h: 64+5};
      const PROCESS = {x: 50+46, y: 155+42};
      const PROCESS_ROWS = 6;
      const PROCESS_COLS = 7;
      
      let cnv = document.querySelector("body > canvas");
      while (cnv.width != 1280 || cnv.height != 720)
          await new Promise(res => setTimeout(res, 100));
      
      while (true) {
          const pixels = new Uint32Array(cnv.getContext("2d").getImageData(0, 0, cnv.width, cnv.height).data.buffer);
          function getPixel(x, y) { return pixels[y * cnv.width + x]; }
          
          if (getPixel(IO_EVENTS.x, IO_EVENTS.y) == 0xFF808000);
              await pressKey("Space");
          let cpuStatuses = [];
          for (let i = 0; i < CPUS; i++) {
              const p = getPixel(CPU1.x + SQUARE.w * i, CPU1.y);
              cpuStatuses.push(
                  p == 0xFF000000 ? 1 :
                  p == 0xFF9A9B9B ? 2 :
                  p == 0xFF00FF00 ? 3 :
                  p == 0xFFE6D8B0 ? 4 :
                  0);
          }
          let processStatuses = [];
          for (let r = 0; r < PROCESS_ROWS; r++) {
              for (let c = 0; c < PROCESS_COLS; c++) {
                  const p = getPixel(PROCESS.x + SQUARE.w * c, PROCESS.y + SQUARE.h * r);
                  let s =
                      p == 0xFF000000 ? 1 :
                      p == 0xFF9A9B9B ? 2 :
                      p == 0xFF00FF00 ? 3 :
                      p == 0xFF00FFFF ? 4 :
                      p == 0xFF00A5FF ? 5 :
                      p == 0xFF0000FF ? 6 :
                      p == 0xFF00008B ? 7 :
                      p == 0xFF000050 ? 8 :
                      0;
                  if (s >= 3)
                      processStatuses.push({r, c, status: s});
              }
          }
          
          processStatuses.sort((a, b) => a.status - b.status);
          for (let i = 0; i < cpuStatuses.length; i++) {
              if (cpuStatuses[i] < 1)
                  continue;
              if (cpuStatuses[i] >= 2)
                  await pressKey("Digit" + "1234567890".charAt(i));
              const p = processStatuses.pop();
              if (p !== undefined)
                  await clickMouse(PROCESS.x + SQUARE.w * p.c, PROCESS.y + SQUARE.h * p.r);
          }
          
          await new Promise(res => setTimeout(res, 300));
      }
      
      async function clickMouse(x, y) {
          const rect = cnv.getBoundingClientRect();
          const opts = {
              bubbles: true,
              clientX: rect.left + x * rect.width / 1280,
              clientY: rect.top + y * rect.height / 720,
          };
          cnv.dispatchEvent(new MouseEvent("mousemove", {...opts, buttons: 0}));
          cnv.dispatchEvent(new MouseEvent("mousedown", {...opts, buttons: 1}));
          cnv.dispatchEvent(new MouseEvent("mouseup", {...opts, buttons: 0}));
          await new Promise(res => requestAnimationFrame(res));
      }
      
      async function pressKey(code) {
          cnv.dispatchEvent(new KeyboardEvent("keydown", {code, bubbles: true}));
          cnv.dispatchEvent(new KeyboardEvent("keyup", {code, bubbles: true}));
          await new Promise(res => requestAnimationFrame(res));
      }
  })();