The online co-op functionality is fresh and may have unpredictable consequences, so I recommend making a backup of the save folder, which is located here:
%userprofile%\\appdata\\locallow\\LionsShade\\

I had to adjust a lot of things in the game in order to make it work online. I think I tested everything. Hopefully, I didn't break anything.

The demo will be updated later, possibly with the next update.

• Added network co-op.
  
• Island: New battle soundtrack added.
  
• Island: The multi-tool can now be used to saw off the remains of enemies, or even attack enemies that are still alive.
  
• Island: Random enemies no longer patrol the area separately from enemy waves.
  
• Island: Time acceleration from the bed now additionally accelerates the day/night change (40x)
  
• Island: the character finally lies down in bed instead of sitting, and it is also possible to lie down on both sides.
  
• Island: The chair near the upgrade tables and chests no longer blocks the character.
  
• Changed the voice of the male character when damaged or falling, now it is less dramatic.
  
• Added heavy breathing to the character when stamina is low.
  
• The character no longer performs an animation of picking up an item if there is no space in the inventory.
  
• The Nuclear Desert level has been slightly modified to avoid softlocks.
  
• Fixed a bug when triggering a quantum leap, which sometimes blocked character control.
  
• Fixed an issue where exiting photo-mode was blocked.
  
• Fixed an issue where sometimes the character would get stuck on the ladder (improved camera behavior when moving on the ladder)