It will be difficult to replace the controller without investing more into it than the end result would be worth. It doesn't even have "proportional" steering, just hard left and hard right, centered by a spring.
Kind of funny about the brand though, the other commentor said it looked like a...
Is there any branding on the bottom? That's a "toy-grade," meaning there will be limited upgrade and repair/replacement parts available. The WRX shell is nice, and even comes pre-wired with lights, probably the most valuable part of the vehicle.