Hey there,
Keep in mind I'm not the ultimate copyright holder to this intellectual property... that honor goes to whoever owns the Dune 2 license, which I believe is currently Electronic Arts. So I'm not sure how that would extend to you, but I might be wary of it. If you own a copy of the Dune 2 game (as you are legally required to download and play my game), then I'd say you're ok, but I'm not an expert on it.
Cheers