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I just solved it myself: At the position where the green key is, go down and hit the fire button at the same time. Opening the door with the green lock also requires the fire button. I got the key position from the longplay on YouTube.  On my screen I do not see anything that resembles a green key. 

Hello tonno_insuperabile, Sorry, but this is no help at all. I know where the fire button is and how to use it. Am I the only one who has no enemies coming up, nothing to pick up, nowhere to go to? Should the game say "Trainer coded by..."? Please help

Hope this is no a stupid question: How do I play the game? Are there any special keys on the keyboard? I can go left and right, jump, and crouch. And pause / resume the game. That´s it.

I am new to gaming and this is just the second game I purchased.

 Thanks, Jan

Thanks, Richard. So I guess having the source code on GitHub does not count.

What exactly means "The games must be previously unreleased", please? I published my development code openly on GitHub (https://github.com/jklingel/ShootingStars/releases) but not the final version so far. Can I still send my prg file in?