Sorry for the negative vote. I didn't mean to discourage multiplayer feature, but there are a few problems that will appear in multiplayer such as the world being full, bugs ,and network interference, but all of that is manageable.
The only thing concerning me so far is trolling. You dont want to build a space station then having it destroyed by someone's debris accidentally. you can't ban them for throwing debris, but you cant also set everything in passive mode because it will simply render docking useless. Also what if someone acctually intent to troll using their debris but they say it's an accident ?