Colony Survival vs Wurm Online
Colony Survival
Colony Survival is a voxel-based town-building simulation game that emphasizes on ensuring the survival (and expansion) of your colony of people, be it by making sure they have enough food to not starve to death or by stationing enough archers around the parameter of your castle walls to repel zombies. Like Minecraft or any sandbox games, you are free to build any base you like (underground, in the sky, or a proper medieval castle with a moat and a drawbridge) as long as you've got the materials (a.k.a. blocks) to go with it and there are various crafting stations which you can build and then assign a worker to just so you can create better and more advanced items.Aside from its infinite, procedurally-generated world, the game also uses an advanced 3D dynamic pathfinding system, allowing you to funnel your people along a specific path simply by having the necessary designs. The same goes for the zombies which usually come out at night to besiege your castle and your sleeping populace. As long as the zombies can't get in and slaughter your people, you can keep expanding your population and your kingdom to whatever size you like!
Colony Survival can even be customized to whatever difficulty you like, depending on how well you think you can best the zombies. So, if you enjoy Minecraft-like games but you also happen to enjoy a "build your own maze", tower defense-like gameplay, then Colony Survival game is definitely for you!
Wurm Online
Wurm Online is a unique sandbox/adventure RPG that many has been touting as being the most realistic one ever. The game is not a solo survival game unlike Minecraft. Instead, you are given the opportunity to build your own settlement - literally from the ground up - and help it to grow. Being an MMO, you can enlist the help of other players to develop your settlement from being little more than a camp with a few shabby and lopsided huts into something that passing bandits might be eyeing hungrily at.There is also an adventure element in this game where you get to venture of into the wilderness to fight a variety of creatures to earn some loot and to level up. Players who enjoy clashing swords with their fellow players can even hop into a PvP world server to enjoy some open world PvP. That said, things will go by a bit slowly if you are playing the game alone though. Wurm Online is an MMO for a reason!
The game has nothing but a fun and great experience to offer to its players and best yet, it's free to play! You can opt for a premium membership if you like just so you can play on multiple servers but, as mentioned, the game can be enjoyed without having to spend a cent.