Making of LLemMings

Make them selectable

ChatGPT: prompt below (there be human cheats in here)

>>> Prompt:

We're making a game. I need to add something.

Given lemmings that looks like this
const Lemming = {
id: -49152,
age: 0,
x: 0,
y: 0,
width: 10,
height: 20,
velX: 0,
velY: 0,
maxVelX: 0.2,
deadlyVelY: 3.5,
onGround: false,
isDead: false,
update: function() { ... }
draw: function() { ... }

Additionally, the following is already declared in the game:
const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");

The lemmings are drawn on the canvas, I want to be able to select them to eventually apply an action
to them, for instance "stop walking". You can add that action, but know that I will add more actions
later. Indicate with a square around the lemming that is currently selected.

It is important that you use the declared things I mentioned above and just give me the code with
minor comments -- be brief, don't explain anything in plain text.

>>> Catch-up notes:
Backup was named: 'index - Copy (24)-selectable lemmings.html'
Associated LLM context: n/a