Степан Крапивин

template should contain exactly one root element

const inputEl = document.querySelector('input')
const btnMinus = document.querySelector('.btn-minus')
const btnPlus = document.querySelector('.btn-plus')

const changeInputValue = num => {
	const newValue = inputEl.value + num
	inputEl.value = newValue
	inputEl.setAttribute('value', newValue)
}

btnMinus.addEventListener('click', () => {
	changeInputValue(-1)
})

btnPlus.addEventListener('click', () => {
	changeInputValue(1)
})

const priceEl = document.querySelector('.price')
const resultEl = document.querySelector('.result');

const callback = mutationList => {
  for (const mutation of mutationsList) {
    if (mutation.attributeName === 'value') {
      resultEl.textContent = priceEl.textContent * inputEl.value 
    }
  }
};

const observer = new MutationObserver(callback);

observer.observe(inputEl, { attributes: true });

<img src="./picture.png" alt="picture">
<img src="picture.png" alt="picture">

const player = {
	x: 0,
	y: 0,
	speed: 3
};
const target = {
	x: 100,
	y: 300
};

// Ваша функция для обновления
const update = () => {
	const angle = Math.atan2(target.y - player.y, target.x - player.x);
	const distance = Math.hypot(target.x - player.x, target.y - player.y);

	if (distance > player.speed) {
		player.x += Math.cos(angle) * player.speed;
		player.y += Math.sin(angle) * player.speed;
	} else {
		player.x += Math.cos(angle) * distance;
		player.y += Math.sin(angle) * distance;
	}

	requestAnimationFrame(update);
};
update();

const players = {
    player1: {
      attack: 5,
      defense: 3,
      speed: 5,
      control: 5,
      strike: 5,
      stateOnSat: false
    },
    player2: {
      attack: 3,
      defense: 5,
      speed: 4,
      control: 4,
      strike: 5,
      stateOnSat: false
    }
  }

  const btnPlus = document.querySelectorAll('.btn-plus')

  btnPlus[0].onclick = () => {
    players.player1.stateOnSat = true
    alert(players.player1.stateOnSat) // true
  }

  // Или 
  btnPlus[1].addEventListener('click', () => {
    players.player2.stateOnSat = true
  })

<button class="fas fa-plus-square btn btn-plus" onclick="players.player2.stateOnSat = true">Plus</button>

<meta name="viewport" content="width=device-width, initial-scale=1">

@media only screen and (min-width: 480px) {
  #___gcse_0 input[type="text"] {
      padding: 7px !important;
  }
 }