1. Go down through the teleporter. Jump down left of the blade so that it bumps into the wooden block at the left. Keep THRUST (=shift,space or ctrl) pressed. Then go down right of the blade then left again until the way to the blue color switch is free.
2. Now you can reach the blue color. Touch it before the blade destroys it.
3. Make the blade go up in the left corner of the room.
4. Now take the red teleporter at the right. Be careful that the blade doesn't destroy the purple color switch. Remove the blue blocks.
5. Go down again and take the purple color. Smash the purple blocks. Now only the green and red ones remains. It's no problem to remove them.