Your ship clipped a fracture in spacetime and came apart along an axis that isn't supposed to exist. What's left of you is running across the exposed lattice of a rotating tesseract — a shape with a real fourth dimension, spinning through the XW, ZW, and YW planes and projected down into the track beneath your feet. Somewhere past the sixth layer of the fold is the Anchor: the one fixed point that can pull you back into three dimensions before you're smeared across all of them.
Dodge the shard walls. Collect the hyper-orbs — vertices the tesseract sheds as it turns — to charge your own 4D energy. At full charge, press F to phase-shift and pass through danger for a few seconds. Survive long enough and the fold deepens: each layer changes the geometry, the speed, and the light — until the fold itself wakes up. The Convergence is what's left of every layer you crossed, fused into one shape with glowing eyes and horns that turn through the fourth dimension. It doesn't chase you. It calls down a purple storm and waits for you to come to it.