Click the green flag twice. Try to get to the purple door. Don't touch the red. The orange makes you shrink. The green makes you normal size.
This is the first Flying Square: http://scratch.mit.edu/projects/ralpher/3154971 and I personally think it's better than the second one. The square kind of floats around, so if you could tell me how to make it actually jump, that would be great. Please report any glitches. If you have any suggestions, please say so.