From the itch.io page:
Alpha Duo Roleplaying: Basic Rules gives you all the tools you need to roleplay in multiple genres—in less than 10 pages!
This short, no-nonsense document lays out enough rules to support your beloved roleplaying adventures from any genre using a single, unified system that you can learn in one sitting. Use it for space pirates, classic fantasy, cyberpunk, or any other genre; if it's a story of adventure for a handful of protagonists, Alpha Duo has you covered!
Why choose Alpha Duo Roleplaying: Basic Rules over other systems?
Handles adventure stories in any genre
Easy to learn, but still robust and flexible
Doesn't assume combat as the primary form of conflict
Less accounting and bookkeeping than mainstream titles
Choose your own complexity level—even in the middle of gameplay!
So download the file, grab some dice, and start your own customized adventure with your friends!