Plenty of really cool concepts for Games in the SCP Foundation. I’ve been working towards a Alien Invasion | Kaiju Survival Terror and recently found a similar SCP known as SCP-5391 most likely inspired by Pacific Rim. With a few changes I could swap out my story, for the SCP-5391 background.
I enjoy all of the SCPs and can see translations into Interactive experiences for most of them. One of my favorites is SCP-3008 Infinite IKEA which has been translated into several games, but, I would do things a little different such as Infinite Abandoned Toys R Us with Monster Toys. LOL.
In regards to protecting your ideas, I recommend getting Software Patents. Perform a Patent search yourself to make sure you’re not infringing on someone else. Virtually impossible to stop software pirates, by the nature of software itself. Focus on those who purchase and support your products.
Good Luck to you on your Game Dev Journey.