When I first got there, I tried for about 15 mins to run in the long room and then spin jump through the first door juuuuust right so that I would land on the blocks. I could only break through the first couple rows of blocks. Then I started doing a speedball into the room and smashing in to the blocks with that, but I believe I only got through three blocks doing it that way. A bigger hint, perhaps?
Did you actually shinespark downwards, or did you unmorph and fall while somehow managing to still flash? It's confusing the way the video slows down and then speeds up.
I'll try it again later. The little green smiley faces are cute. Btw, why did you put 2 morph balls in the game? I wasn't sure if you used the wrong PLM or if it was intentional.