It was really just a joke.

But with greater than 1080P resolutions, the image is scaled down to HD. Lego Marvel did this I believe.

You could probably look into using 4x SSAA ... 

Intriguing. But I will just say that the special effects need a lot of work. They look really bad (that red explosion thing and the way it disappears, and the white smoke thing that seems to freeze in space-time). The rest is pleasing to the eyes, but those effects are just... yuck.

Already using 8x

Is that another one of your jokes ? 

No.

Aliasing is extremely observable due to the art-style. It can look good in a pixel-art type sense, but for most situations it's something I'd like to avoid.

I'm doing a brute force method for generic edge aliasing, and then I'm using an additional "infinite AA" method for outlines once they become less than a couple pixels wide.