In the absence of the original master file and with permission from Alsnapz, I have recreated "MalfBackground" in a higher resolution. This is the background used for Malfaren, Cobalt, and the upcoming Yesenia.

I took the opportunity to do some experimenting, and used Blender to recreate and render the scene. I put a lot of effort into trying to make it fit the style of the game and look almost like a 2D scene.
The new background has been added to Malfaren and Cobalt.
Subscribers to $3-or-higher tiers of mine or Alsnapz's have early access to the game here: https://www.hungrycritters.net/games/helixftr-deluxe/
Helixftr Deluxe is tested in Mozilla Firefox and Google Chrome on Windows 10.
If Helixftr Deluxe crashes or does not start for you, please follow the instructions on the following page to help me diagnose the problem: https://www.hungrycritters.net/games/helixftr-deluxe/report/