Well, thanks for your opinions, about the lip synch, there were problems with quality and adobe premiere ( not the first time with this program though... ) and it cuts parts of the lip synch I used. As you said, it's sarcastic, but i dunno if you saw the anime, if you imagine the character saying that, it will stop being sarcastic to be "realistic", of what he thinks of the world and what he's doing about it :
Monday finds you like a bomb
Thats been left ticking there too long
Youre bleeding
Some days theres nothing left to learn
From the point of no return
You're leaving
Hey hey I saved the world today
Everybodys happy now
The bad things gone away
And everybodys happy now
The good things here to stay
Please let it stay
Theres a million mouths to feed
And Ive got everything I need
Im breathing
And theres a hurting thing inside
But Ive got everything to hide
Im grieving
Hey hey I saved the world today
Everybodys happy now
The bad things gone away
And everybodys happy now
The good things here to stay
Please let it stay
Doo doo doo doo doo the good thing
Hey hey I saved the world today
Everybodys happy now
The bad things gone away
And everybodys happy now
The good things here to stay
Please let it stay
Everybodys happy now
Almost all the lyrics can be related to the anime, even if it doesn't have that purpose

Thanks.