First we're talking about a potentiel market restricted to ubuntu users, the small portion that would give money for a piece of software. Then we're talking about a game added to the ubuntu store when it was released in a pay what you want bundle. Then again the dev is known for having a poor opinion of linux and its communities. The port itself has a few bugs.

Not exactly the recipe for success here.

As an example, I'm a linux gamer, I own a copy of the humble bundle including super meat boy and after using it for a couple years, I for sure will stay away from ubuntu for technical, personal and ethical reasons. So don't expect my money showing up on the ubuntu store.