You can still try it out at http://www.masswerk.at/spacewar/
The game below is what I came up with and you can start playing the game by clicking on the green flag. But I am sure you can do much better than me. Just unleash your creativity!
So you can start innovating through coding. Right! But then you need to learn to code. And then it struck me. Coding is a language, and if you need to grow up in this world, you might need to learn it just as much as you need to learn English or any other language. Scratch is a great way to start. I suggest you go look at the MIT pages about Scratch.
Who knows, you may come up with the next game that everyone will want!