A hint in the room with the rocket launcher seems to suggest that rockets can destroy some walls - but I've never been able to gets the rockets to follow me well enough to guide them to any walls, so I can't confirm that.
Yeah, no wa in hell I can hit that door.
The best I can manage (by standing beneath the rocket shooter, one milimeter to the right and jumping)
is to get the rocket to fly super close past the grabbling arm block on the right, jsut closely flying around it without touching it.
and flying into the bottom platform, exploding there without any effect.
simply expressed:
the minimal movement radius of the rocket is jsut that much bigger in the actual game than in the video.no way that the rocket can fly past that middle block on the left side.
will try again, with the door now gone.