Starve.io vs Urban Dead
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.
Urban Dead
Urban Dead is a mainly text-based MMO game set in a post-apocalyptic city that you can play straight from your browser. Assume the role as an urban survivor trapped in a quarantined city just trying to get by. However, unlike most games, Urban Dead is an MMO and as such, you'll encounter other players as you wander from place to place hoping to scavenge something - anything - that might help you. These players can be friendly or hostile (though, it's more often the case the latter).You can even set up a center of operations, so to speak, by clearing a place out and lock the place down. Other players might try to break into your base though, so it might be best to recruit a few trustworthy players to help you maintain your base and keep it as well as everything you hoard in it safe from any looters. Of course, there are also zombies that will attack your base and you, if you are unlucky enough to bump into one or an entire horde.
Urban Dead is a quite different text-based game admittedly, but it is still very addictive to play. It might be best to play with friends though due to how its base building feature is structured and well, there is always safety in numbers.