It's official, we've licensed the Otter UI library to use in Skullgirls.
Why Otter and not Scaleform? Perhaps the most important design decision for any middleware is where it draws the line in the sand: how much it does, and how much it relies on the game to provide. You don't want it to leave a critical and difficult problem for the game to deal with, but you also don't want it doing trivial things, which often makes the middleware unnecessarily rigid and inflexible.
In a nutshell:
Lastly but perhaps most importantly, the Aonyx team has been a pleasure to work with.
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