It took me a while to understand what was going on with your game. Once I got it it was fun, though!
For anyone else confused: the goal is to keep the light colored "snake" moving through the dark colored "tunnel". When the snake stops moving, it's because it's at a junction in the tunnel. You're goal is to tell the snake which direction to go (either left or right) _from its perspective_.
Wow, that's a great test of spatial reasoning (or something akin to spatial reasoning). You kind of have to rotate the shape in your brain to figure out which direction to turn from the line's perspective. I've driven with people who can't follow GPS directions unless it's in "first person" mode, e.g. if the line is moving "down" but then heads to the "right", you actually need to turn left, but they think you need to turn right or are just confused in general because the orientation is different - and I wonder if they could train their brain to work that way by playing something like this.
For anyone else confused: the goal is to keep the light colored "snake" moving through the dark colored "tunnel". When the snake stops moving, it's because it's at a junction in the tunnel. You're goal is to tell the snake which direction to go (either left or right) _from its perspective_.