Uhhh
1) You didn't bother to line up the audio clip properly
2) It's not exactly a huge secret, the trick to upsizing/downsizing your video. Resize the stage, then hit the 'select multiple frames' button, and then resize everything selected to match the new stage.
3) This was, what, four seconds worth of video? And some text. Why couldn't you just wait until the game was released?