Made of little things.

// Follow the actual moving/crippled boss using only ordinary pointer and flight inputs.
export function bossPilot(page,frame){
 return async ms=>{
  for(let elapsed=0;elapsed<ms;elapsed+=100){
   if(await frame.locator('#app').getAttribute('data-phase')!=='playing')break;
   const {d,r}=await frame.locator('#game').evaluate(n=>({d:{...n.dataset},r:n.getBoundingClientRect().toJSON()}));
   const boss=JSON.parse(d.rigs).find(r=>r.kind==='core');if(!boss)break;
   const dx=boss.x-Number(d.shipX)-230,dy=boss.y-Number(d.shipY)-20;
   for(const [key,held] of [['KeyD',dx>35],['KeyA',dx<-35],['KeyS',dy>35],['KeyW',dy<-35]])await page.keyboard[held?'down':'up'](key);
   await page.mouse.move(r.left+(boss.x-Number(d.camera))*Number(d.viewScale),r.top+(boss.y-Number(d.cameraY))*Number(d.viewScale));
   await page.clock.runFor(Math.min(100,ms-elapsed));
  }
  for(const key of ['KeyD','KeyA','KeyS','KeyW'])await page.keyboard.up(key);
 };
}