Interesting you say that. My game is pretty simple and could easily be done in Unity (gameplay-wise). Visually that would be an effort and a half. I'd use Unity to make my game so that I had a wider audience (most of my friends are non-gamers and so don't know any better than to own a Mac , so they can't try my game even though they want to just to see what I do), but I want my game to look nice (part me being a graphics whore, and part me taking pride as a shader programmer), so I stick with A8 even though it'll only work on Windows.

To me it's like this:
Unity effort to use industry-standard effects:
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A8 effort to use industry-standard effects:
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A8 effort to use gorgeous, application-specific effects:
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Unity effort to use gorgeous, application-specific effects:
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Jibb