This level requires movement in all 4 dimensions (the second wall is too high to jump over).

4 dimensions? X, Y, Z and what else?

The V dimension (deriving from the name of the game, Vieger). It is a 4th spacial dimension that does not exist outside games and imaginations.

Interesting!

mind blown KABOOOOOOOM

Looks more like just another name for an ability to phase through walls. But OK.

(of course I haven't see anything apart from that screenshot so that's just speculation)

This game not only utilizes 4D to go "through" walls (technically you're going around them), it also utilizes it in dodging obstacles, crossing gaps without dying, etc.