itch.io

Not sure what you mean by "converted to .deb file". When I extract the zip, I see:

OurApartmentPreview/
├── LinuxPlayer_s.debug
├── OurApartmentPreview_Data/
├── OurApartmentPreview.x86_64
├── UnityPlayer_s.debug
└── UnityPlayer.so

Just run "OurApartmentPreview.x86_64" like a normal binary, e.g. with "./OurApartmentPreview.x86_64" in your terminal or double-click it in your GUI file manager.