It would be quite nice to have the game integrated into Steam, somewhat like Realm of the Mad God was.
Of course, I have no clue how the developer would go about this, whether she'd make a request or Valve needs to. I simply think it'd be convenient, as I wouldn't have to open my web browser to play and all. Donations could also be managed through the Steam Wallet system, and the game would have access to a much larger audience.