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Loool OMA's fps kit xD. Don't lie and say YOU created this game xD.
Ok this looks good but don't praise the game soooo in the sky. It is good for that you're a beginner.
A few improvements you could easily make: Scale the tanks to a realistic size, Scale this "dead man" to a realistic size, Make that text in the middle disappear after some time and add some sound. These improvements can easily be done!
Didn't scared me... If you want to improve it, recreate it first from scratch and just...aaarhg i don't know.
And be honestly: This didn't took 4 days to programm. If anyone want to recreate this game, he just drops a fps-controller prefab from unity into the scene, creates a simple random script that lets slender appear in front of you and designs some terrain. I think this took 1 hour to make...
But i think before you start your next project, you should just learn better/more scripting and then you could create a good game!
So: Go on, learn, take your time and you could create a good game! :D