I downloaded the demo from itch.io, and tried to run it. I get a logo screen with options "play / settings / exit".  When I select "play", I'm asked to select a mod. When I select "vanilla", the game immediately crashes.

Running in a terminal allows me to see messages like this (there are a lot of messages, but I've just picked a couple of bits that sound relevant):

[SNAKE2D] ---Running on a: Linux, amd64 Platform.

[SNAKE2D] SHADER COMPILED: class snake2d.VboSpritePointsOpti$ShaderDebug 1

[LWJGL] OpenGL debug message

    ID: 0x502

    Source: API

    Type: ERROR

    Severity: HIGH

    Message: GL_INVALID_OPERATION error generated. VAO names must be generated with glGenVertexArrays before they can be bound or used.