Neat concept, looks like you spent quite a bit of time on that.
But would it have to be 'Cortex Command: <I forget the subtitle
>.' Since the whole Cortex Command name (I'm guessing) is based on the story/campaign of Cortex Command.
It could be 'Gladiator <so-and-whatever>' and then in small text below it says 'Made with the Cortex Command Engine' or whatever.
I don't know, but anything that doesn't use 'Cortex Command' for it's main title, or people will think that it's a sequel.
*cough*