PetFight.io

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PetFight.io is an online multiplayer battler where you fight against other players to see who can dominate the server the longest! Shoot at monsters and other players and defeat them to gain loot bags which contain pets -- deploy your pet to get an extra boost to Defense, extra Speed, Healing, and more! As you defeat enemies, you'll also earn experience which will cause you to level up -- growing bigger, stronger, but also a little slower!

The controls are simple:

- WASD or Arrow Keys to Move
- Click with your Mouse to shoot
- Press the "F" key to use your pet!

You can also plug in a Gamepad controller (like an Xbox controller) and control the game that way. 

The game never ends, so you can keep fighting and leveling up to see how high you can get before you are taken down!