I think that the addition of limited oxygen supply, at least while EVA, would be a great idea, if done well. But I have to agree with Lazarus that food might make the game less fun. Let me clarify that hunger mechanics are actually something I really love in games. I confess that I really loved the addition of a hunger bar in Minecraft, and I always felt that Elder Scrolls games and Fallout would have benifited from a hunger mechanic, at least similar to the sleep mechanic. But in those games, food is a more centric theme. Medieval-fantasy is an age where food is glorified by big hunks of seasoned meat, warm ale, bread, cheese etc. And Minecraft is at its core about struggling to survive in a environment with scarce resources. So in those games, hunger is important. But in Starmade, we have a futuristic setting where food is probably engineered nutrient mush that can be consumed through a built-in straw in your suit. But it\'s not just food isn\'t thematically appropriate, it\'s also an unnecessary chore, whereas in Minecraft it\'s a pleasure to seed, nurture, harvest, and cook your food. You\'re often proud of your food. In starmade it would just be a periodic distraction from what\'s fun about the game.
Life-support system, on the other hand, would be pretty cool! Not only would it be thematically appropriate, it would encourage people to build ships with spacious interiors and easy access in and out. If there was a some sort of pressure system, it might even encourage people to build strategic bulkheads to keep the atmosphere from leaking out of damaged hull!
So good idea +1