Castle Gafa is a lovely macro-enabled PowerPoint presentation*(game?) that embarks you in a WOLFENSTEIN-like adventure. You're trapped in the underground or overground castle of GAFA (Google Apple Facebook and Amazon) and you have to force your way out with killing the FOSSists trying to kill you, and meeting new people like you, maybe?
This isn't a shooting game however, it's a page-by-page novel that takes you to many adventures, you can also hunt for lore pieces, unlock documents and audio. Can you really escape the Castle GAFA?
Coming soon, Demo is in development