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Thank you very much!

Yes, this is planned and should come with an update in a week or two. It will be an endless mode where the story missions are disabled and the difficulty gets increasingly harder. It's likely that we'll add a highscore table for this mode.

It's really difficult to tell why this is happening for you. It's the same game running in the same engine with the same settings. I'm a Linux user myself, and I don't have any issues. And no other Linux user has reported anything like it, so unless we can find a way to reproduce the noise issues there's not much I can do. What sound hardware are you using, and which Linux distribution?

Thank you for your feedback!
The noise sounds like the sound buffer isn't keeping up. This is difficult to diagnose though. Could be that PulseAudio is causing trouble. Maybe check your audio settings and try different configurations.
The missing first mission is a known bug that will be fixed with the next update. This can happen in rare cases when you load a game that you have saved without even starting the first mission.

We're currently preparing a demo. It will be uploaded some time tomorrow.

Thank you very much! :-)

• “If you’re a Trek fan, sci-fi fan, a fan of roguelikes, a fan of simulators, or a fan of difficult games, Deep Sixed is a no-brainer.”
  Lou's Reviews
• Rock, Paper, Shotgun calls Deep Sixed "quite unlike any space sim I’ve ever played", 
• Popular YouTuber Splattercat calls Deep Sixed "Papers Please meets deep space survival!"

A secretive corporation that holds a monopoly on the technology necessary to "fold space", travelling light-years in mere moments, has shown an obsessive interest in a large uncharted nebula in a distant arm of the galaxy.

The Pilot is working off the remainder of her sentence as an involuntary stellar cartographer for this corporation. She has been issued a small spacecraft that is equipped with a finicky deep space scanner and the support of an infantile Artificial Intelligence unit, and given orders to map as much as possible and report back with her findings.

What she discovers out there will change her life forever, if she can get back home in one piece.

Features

• Life without an "undo" button. Your ship stays with you from start to finish. If something breaks, it'll stay broken until you figure out how to fix it. 
• A universe of procedurally generated mysteries for the ambitious explorer.
• A diverse ecosystem of intergalactic fauna with their own predator, prey and scavenger roles to play.
• A steep difficulty-curve that will push your ability to stay calm under pressure to the limits.
• A compelling story of friendship and compassion that promises to surprise and entertain.

And it's on sale for the next week or so, so we encourage you to check it out for yourself!