Sorry to hear this. It might be an issue with godot's vulkan renderer not working with older hardware. what are the specs/operating system of your PC?
Small update: I tried running on older hardware/Win10 and I think the issue is that it's a build using Vulkan instead of OpenGL.
I tried to make an OpenGL build, but it broke pretty much every graphical asset in the main scene :(
I'll see what I can do about providing better compatibility in future releases. Sorry about this x.x