If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Try to traverse as far as possible the side of two building like a cyberpunk ninja.
Left-Right Arrows to move.
Up to switch building.
Down to duck, keep to duck more
Space to spin and destroy blue blocks, keep to spin more
are the taller ones, avoid them or duck
are breakeable, spin to break without taking damage
try to avoid them moving on the platform or swapping on the other one (up key)