Cross-platform and mobile support (slobber)
Especially mobile... The money you can make with that... (slobber)
And yes, you can make real money with mobilegames. The games were you make money with are free-to-play (with content you can buy for real money).
After making and publishing 10 simple games like this:
Simple game
One or two will probably be more or less "successful" (200-500 players), and you make a few hundred a month.
The same goes for normal app (I tried it).

Beside that, I will finally be able to make my own rpgs with the acknex engine for mobile devices! Classic RPGs made with acknex!!