10 Things I Would've Sorted with the Film...

1. Fixed POOR quality green screen shots.
2. Hidden loops in stepping with more accurate, better looking explosions.
3. Inserted footage of crowds fleeing - adding to hysteria.
4. Applied more color-corrections - you can still tell the footage is from very different sources. I would've simply created more monotonous color schemes, shadow/mid/highlight patterns and a better bloom, highlighting sparks and hiding rushed bits more nicely.
5. Cut the music better.
6. Featured higher quality Youtube vids (HD filtered).
7. Sorted the footsteps on cities and land. Especially the shots at an angle! ARR!
8. Close ups of face n upper body while walking.
9. Insertion of FUKKK OFFF's logo.
10. Re-shot the film of an older (non flat-screen) television and resynced the track giving everything a digitized retro VHS feel.