Renderer seems to fail

[ghost]

I have MacOS 10.13.6. I managed to download the dependencies and build everything, but when I started playing (and editing the code a bit) the fractals were blue and the marble was yellow — there was no change in color, whatever the level and whatever the resolution. What's more, the graphics seemed bad-quality and pixelated, in contrast to what I saw in the multiple videos on this game.

How do I fix this?