It could be a fantastic alternative for people that can't afford a good enough computer, or for people that usually use something not powerful enough to run Spiral Knights like a Netbook. The Ouya only costs $99, so it's not like it will break the bank of most people. If it's feasible, why not try to attract a wider audience? I couldn't image anyone would take so much offense as to stop playing just because the game supports a new platform, and it would bring it new players in to bolster the community.

The game should actually transfer pretty well to the controller; there's not a lot of complex controls considering most boil down to move, attack, defend, switch weapon, and then 4 for use item. So, as an example control configuration, you've got the control stick to move, the triggers to cycle through which item at the top you've select, the four buttons for attack, defend, switch weapon, and use item. You could even map simple commands to the D-Pad so you could quickly tell people to charge or whatever else.