I have been contacted by people who have the same problem as I did.
I hold an answer to this question, thought I would share it here if more people find this post wondering the same as I did some time ago.

They are fine with it (or at least Edmund is), so go nuts! :)
Read it here ->http://www.formspring.me/EdmundM/q/426167225297162040

I never started this series on my own - but if I will later on I can now back it up.
Good luck now!

My videos will more or less only contain gameplay of Super Meat Boy; commented by me.
I guess that would mean failure - over and over again.

I'm trying to find some kind of written proof to show YouTube; to be 1oo% sure I won’t get denied to upload my videos :)
I will try the form just to see if I can get a written permission.
Thank you, Zarkith! :D

I've searched the official page of Super Meat Boy, as well as this forum; haven't found the answer yet.
Does anyone here know if I'm allowed to monetize my videos of SMB on YouTube?

I would love it if there was a link to the terms/proof that tells me that I'm allowed 

Thanks for any help!
/Hamnisu