Answer 1

Is this a question or a statement?
Yes you can use HTML/CSS/JS to create games. There are many HTML 5 games available online right now.
https://html5games.com/

Answer 2

The obvious answer is YES!

https://code.sololearn.com/WdwSg2Um7KD2/?ref=app
https://code.sololearn.com/WQK06A75id02/?ref=app
https://code.sololearn.com/WB2rny04ROP3/?ref=app
https://code.sololearn.com/WGObAy7i6amA/?ref=app
https://code.sololearn.com/WyyBylG1NvdU/?ref=app
https://code.sololearn.com/WQzJGkuhEmNF/?ref=app
https://code.sololearn.com/WPmcR2CPfaIU/?ref=app
https://code.sololearn.com/WMjtqfL1x8gU/?ref=app
https://code.sololearn.com/Wif9i3367Zdx/?ref=app