My text is aligned at right in the game engine even if I aligned it at center.
Here is my text:
These are the properties:
And when the game is launched, it is aligned to right.
One obvious thing would be to convert it to a mesh. I recommend you keep a copy of the original object. Select your text in object mode, then hit Alt+C, and convert the text to a curve, then hit Alt+C again to convert the curve to a mesh.