INTERACTIVE RATING COMPONENT w/ JS

What are you most proud of, and what would you do differently next time?

Proud of turning a list of radio inputs into 'buttons' that returned their assigned values to be used in the JS function.

What specific areas of your project would you like help with?

As my first JavaScript project, I'd love any feedback on my script. Is there a more efficient/better way to do what this project requires?

Also, I made the form 'required' with an if statement within the function

if (radios !== null) {
        formStart.style.display = "none";
        formFinish.style.display = "block";
        selectedMessage.innerText = `You selected ${radios} out of 5`
    }

As the button on the form isn't a submit button, I believe the normal method of adding 'required' to the HTML inputs wouldn't work. Is my workaround ok or once again is there a better way?