a month? good?
I've been working on mine for over three years. Many long breaks and slow progress of course, but still years.
And it's still barely showable. I have no idea how people can create such good games.
You have to be on crack, or have a fit of mania to finish a game like this in a month.
But if you want to make something good, you have to study games, and not just play them. Watching Let's Plays helps. Just try and pick out what works and what doesn't. Try out your ideas in a small environment and see if you can copy what's fun.