The making of a game

Okay, so I am WAY into programming and writing code I think it is amazing at what people can do with a compiler and a keyboard. Any who There's a game at http://www.atc-sim.com it's an Air Traffic Control simulator, which I also <3. So I've read some tutorials on c++ and java and SCAR but I really don't know all that much in any language besides SRL ;)

So for my questions:

• How hard would it be to make a game like that?
• Would adding voice control be really hard?
• Is there any way to tell what language that is written in?

Thanks to all =D