We all know just-about-everyone's favourite indie game's multiplayer is great. Minecraft multiplayer is a mix between co-op and pvp with the options to do either or neither. Now... I can think of two indie games that would benefit from this sandbox-esque multiplayer.
Kerbal Space Program-Build spaceships with friends! Compete or work together!
Project Zomboid- Survive the zombie apocalypse with friends! Slaughter each other over canned food, or work together to defeat the zombie horde!
These are 2 of my fav indie games, and they'd get a lot of publicity and a lot more popular if they went multiplayer sooner, rather than later. I'd enjoy it and I'm sure most of the other players would aswell.
/discuss
inb4 "KSP/PZ DOESNT NEED MULTIPLAYER"
inb4 "minecraft isnt an indie game"
inb4 "KSP/PZ WERENT MEANT FOR MULTIPLAYER"
inb4 'my naem is doge n i suport dis idea'