Developer / Publisher
Details and Conditions
Edmund McMillen has stated publicly that he approves YouTube monetization for any game he works on it seems without any sort of requirements or restrictions, however it is not declared as an official statement anywhere on Team Meat's site or his personal blog. He has mentioned it at least a couple of times on his Spring.me account (which no longer exists) and I've seen him Tweet about it once or twice. From my own personal experience, YouTube will likely not consider social media statements as official confirmation and you might have to contact McMillen himself for a statement. Unfortunately, there's a good chance he'll just link to a social media post which will not be helpful for YouTube. So you are technically allowed to monetize Super Meat Boy gameplay on YouTube but you won't be able to prove it by YouTube's own standards.
What it Means
Videos and streams ARE allowed
You CAN monetize on YouTube and Twitch with ads and subscriptions
You MIGHT NOT be able to sell or charge for access to your content (this would include Twitch "subscriber only" streams)
Any licensed IP or music not owned by the publisher are not covered by this policy