The original 'Ostranauts' soundtrack, composed by Josh Culler (a.k.a. Invisible Acropolis). This DLC will receive updates as new tracks are added to the game, and currently includes:

All 26 Tracks from Ostranauts

The original tracks composed for the game, provided in MP3 and FLAC formats.

• The Sky Kings
  
• The Metal Barge
  
• Panoramic
  
• Echoes of He3
  
• Fool's Gold
  
• Dustball Sunrise
  
• Black Glass
  
• Trinity
  
• The Dragon Son
  
• Home
  
• Broken Stream
  
• Among Giants
  
• The Shredder
  
• Passing the Belltower
  
• Imperfect Memory
  
• Somewhere in the System
  
• Siren's Call
  
• Revelations
  
• Power On Sequence
  
• Signal Confirmed
  
• Ladder Logic
  
• Deadline
  
• Bulkhead
  
• Scope Check
  
• Into the Black
  
• Bootstrap

9 Bonus Tracks

Josh also composed some new tracks a couple years hence, and reworked them into these bonus tracks (MP3).

• Cascade Overflow
  
• Equation Simplex
  
• Galaxiespur
  
• Involution Protocol
  
• Oort Cloud Harvest
  
• Vestigial Assemblage
  
• Wave V Form
  
• Yard of the Derelicts
  
• Yùxiān

Josh's earlier work includes the atmosphere-setting soundtracks composed for NEO Scavenger (2014) and Underrail (2015).