I think the trick would be that the triangles only come from one direction each side and when they rotate just go as far away as possible so you have more time to react.
And after you get 4 games, you will at 120, 180, 250 and 400 experince that the balance stick will get smaller, you get more arrows towards you at the upper right. You will see more squares at the green screen thingy, and you will see more walls using the space.