If you are searching for cute survival online games, Wormmate.io can be an excellent pick. It has colorful and kid-friendly graphics and simple yet enjoyable gameplay where you take control of a little worm.
Namely, you need to compete with other players in eating as much food as you can and grow the longest! However, watch out and try to avoid other worms, as they may smash you.
You can play the game in 2 modes: the first one is Arena, where you are on your own and compete with everyone else on the same level, and the second one is 2 Teams, where a Blue Team and Red Team join their forces to play against each other.
Interestingly, you will find many useful power ups on your way, giving you a speed boost, a huge amount of candies, sharper maneuvering, and many other bonuses.