Salem vs Surviving Mars
Salem
Salem is an old-school and somewhat obscure (but fun) sandbox MMORPG that unlike Wurm Online has a stronger emphasis on its in-depth crafting system and survival aspect rather than building.Similar to Wurm Online though, Salem is not a voxel-based game, but you are still able to mold the game environment through resource gathering, mining and digging in a way that reminds me of the currently-shelved MMORPG, EverQuest Next: Landmark. Of course, although not exactly the focus of the game, you can still build your homestead and the process is quite similar to Wurm Online except that it occurs at a much higher speed.
Not to mention, the game world in Salem is simply humongous to the point where it feels like an actual world. Salem also borrowed some features from ArcheAge where open-world PvP is the norm, so you'll need to be vigilant at all times, but players who kill and steal for no reason will be labelled as criminals and can be punished.
However, as good as it is despite being an indie MMO and all, Salem does have its fair share of flaws due to its low development budget. So, we'd recommend you to take a look at Salem without carrying along any high expectations. It's a pretty good MMORPG like Minecraft, but if you're expecting a Minecraft clone, you may end up disappointing yourself.
Surviving Mars
Surviving Mars is a colony-building game that's set on the red planet published by Paradox Interactive. In this game, you are in charge of the human colonization of Mars project. Aside from extracting various minerals and resources with your army of hardy drones, you'll need to set up a sustainable system of oxygen and water before bringing in the colonists to help with some of the work that drones simply aren't able to do on their own.Despite the obvious flaws in parts of its game mechanics which force players to micromanage almost everything to the point of being a hassle, Surviving Mars has a pretty nice concept and depth, as well as an even nicer style of graphics. The game could use a bit of work, that's for sure, but if they do the changes right, this might just turn into a formidable Mars colony-building simulation - a game that might just help us envision a future where whatever you've built is actually a reality.