Here is a recommendation Red Button gave me called slither.io. You can download it as an app or play online at slither.io.

Safety Features:

There is no chat. You play against people across the globe but you cannot chat, even if you want to.

It is suitable for all ages.

The game requires you to use your mouse or finger to move your snake across the screen, collecting glowing orbs and trying to make other snakes crash into you, but if you crash into a snake then you die. You play with a nickname and not your real name, which makes it safe and it is very fun altogether.

I would recommend playing it first online at slither.io to try it out. If you like it, then download the app.

Epic Chas Gamer 😎