Brutal.io vs Starve.io
Brutal.io
Brutal.io , developed by the very people behind Wings.io, is a competitive PvP game where you get to play as a cell of sorts, much like Agar.io, but with a spiky flail to whack other players with. Like all IO games, Brutal.io is very easy to learn but can be hard to master. Similar to Agar.io as well, you will need to gobble up food fragments scattered around the place to grow your main bulk. The arena you'll do battle in is unique too. It has walls you can take cover behind, and there's even a walled-up area in the middle for smaller cells to hide when escaping from larger cells.Despite the comparison with Agar.io, Brutal.io is not a direct copy of the game. In fact, it builds on what makes the former game so challenging and hence, addictive to play, while subsequently created something that looks and feels different. That being said, Brutal.io is still a game that fans of Agar.io, or any IO games really, would really enjoy.
Starve.io
Starve.io is a unique IO game mainly because it is more of a base-building and survival game rather than just a hack-and-slash arena. In this game, you will need to collect resources and turn them into useful items which will marginally improve your chances of survival. The crafting aspect of the game is very much simplified but it can still take you a while to figure out crucial crafting details like how much resources you need to create a certain item. Also, a quick tip if you will - grab as much food and wood as you can at the get-go.As a survival game, there are several important "meters" that you will need to keep an eye on, such as temperature and hydration. Hunger also something that you will need to frequently deal with, aside from other potentially hostile players as well as other monsters like vampires and zombies if you happen to play its other game modes. There is even a "hunger games" version which frankly feels a lot like a battle royale game.
Unlike many other IO games where players are always pitted against one another, Starve.io is a game in which you can actually choose to coexist with other players rather than just swinging whatever weapon you have in hand at anyone you see... though, many players still do that pretty often, especially those better-equipped ones.