How does this relate to the original Deadnaut (2014)?
Deadnaut and Deadnaut: Signal Lost are both situated in the same universe and feature similar, mission-based gameplay in procedurally-generated locations. Furthermore, in both games you take on the role as a remote handler who controls the action ‘at a distance’ via a physical console. The Deadnaut also uses similar weapons and suits; battles against security systems; trades ‘knowledge’ for gear; and can be cloned upon dying.

Is this a sequel?
Deadnaut: Signal Lost is not a sequel. It is focused on a single Deadnaut, rather than a whole squad. The action is more intimate and tactical, and you can develop your Deadnaut with numerous suit upgrades and abilities. Furthermore, the gameplay is turn-based, not real-time, which helps focus the action.

• Balance: Ghosts enemies can no longer drag deadnauts. This fixes an issue where such enemies could drag characters into the void, resulting in them getting stuck.
  
• Balance: Hacking sentinels is now more effective (easier to hack, hacks last longer).
  
• Balance: Enemies can no longer hit each other with their own projectiles (blast weapons excluded). This matches the behaviour of deadnaut friendly fire.
  
• Balance: The amount of Knowledge stolen by the Siphon flaw has been reduced and capped.
  
• Balance: Mines are now significantly more effective, especially at higher gear levels, and take into account the wielder's combat skill.
  
• Balance: The image created by the projector now decays faster and takes more damage from all sources, however, the wielder's detection skill provides more of a benefit.
  
• Tweak: Stim use is now bound to the left ("[") and right ("]") bracket keys, representing the first and second slots respectively.
  
• Tweak: Deadnauts with melee primaries and ranged secondaries will now use their ranged weapons when appropriate.
  
• Tweak: Deadnauts with melee primaries, scanners and projectors no longer automatically shoot enemies unless they've been spotted or forced to attack.
  
• Tweak: Inter-mission exit game button now reads "Save & exit".
  
• Tweak: Grouped deadnauts are now smarter about spreading out work when a number of consecutive "Investigate" orders are given.
  
• Tweak: Grouped deadnauts will no longer wait for the best hacker to open a door if that hacker is far away.
  
• Fixed: End game debrief was reporting erroneous numbers for "Sentinels hacked".
  
• Fixed: An issue where the chat log would stop working. A side-effect of this change is that extremely large chat logs will have their oldest entries culled.
  
• Fixed: The Siphon flaw allowing a negative Knowledge balance.
  
• Fixed: A few issues when exiting the game.
  
• Fixed: The Selective Deafness flaw no longer allows deadnauts to open disabled (grey) doors.
  
• Fixed: Mines now once again apply critical hit effects.
  
• Fixed: Deadnauts will never attack hacked sentinels unless forced by the player.
  
• Fixed: A rare issue where saved games would fail to load.
  
• Fixed: Additional checks to make sure portals don't teleport deadnauts into the void.
  
• Performance: Updated SQLite library to 3.11.
  
• Performance: Game assemblies are now built with Microsoft's Roslyn compiler.
  
• Performance: Updated screen space ambient occlusion effect.
  
• Performance: Extensive optimisations to memory and CPU usage to reduce stuttering.
  
• Performance: Optimisations to sentinel AI to reduce stuttering in later levels.

• Send passengers out into the fog to investigate locations, find survivors and bring back supplies
  
• Manage defenses, power and resources. But be careful: if you aren’t the saviour they need, they’ll revolt against you
  
• Handle disputes between carriage leaders that can end in dramatic events that swing the balance of power between your defenders and detractors
  
• Monitor your passengers’ dreams to discover what kind of horrors will attack the train – and how to defeat them
  
• Create your own Engineer with special modifiers that determine your train’s starting conditions, as well as the course the game will take
  
• Customise the passengers on board your train, importing photos of friends to give your game that personal touch... right before you send them to their demise
  
• Do your best to avoid the military and cult-like "Fearless" as they seek to eliminate anyone caught in the fog
  
• Interact with intricate machines and devices within a richly detailed, fully 3D cabin