Works fine on GE-Proton9-21 with video cutscenes and the correct depth of field (this was an issue with GE-Proton8-28). The Altus logo displays at the start of the game, all beginning cutscenes work, and the cutscene on Trisha's TV works. I played through the first boss with no issues reported.
No additional parameters are needed.

IMPORTANT! You must set the resolution to 1280x720 and use a borderless window. With a resolution of 1280x800, the Altus logo will work, but other cutscenes won’t.

The game will take a very long time to launch the first time on GE-Proton—wait until the game launches or the "Running" green label disappears in the Steam library.

I had a lot of truble to run this game with cutscenes, used protontricks etc., nothing worked for me. As I thought GE-Proton couldn't launch the game, I saw "Running" label in steam and no game window. Finally I tried to:

• remove all data in .steam/steam/steamapps/compatdata/893180,
• remove ~/.steam/steam/compatibilitytools.d content also
• install fresh GE-Proton9-21 with ProtonUp-QT (install with Discover)
• don't forget to install drivers as GE-Proton requires sudo pacman -S --needed lib32-mesa vulkan-radeon lib32-vulkan-radeon vulkan-icd-loader lib32-vulkan-icd-loader
• restart the Steam, then in the game compatibility properties tick the checkbox and select GE-Proton9-21
• clear all launch options in steam game properties
  Then launched the game and waited for 5-10 minutes, after that the game worked like a charm.

Original Steam Proton-Experimental and v9 work, but there are no cinematics or color bars—just noise instead of the cinematics.