I've extracted the key phrase 'ATOM RPG for apple download free' from your text. Here are some relevant points:

* ATOM RPG is a role-playing game with character creation tools inspired by GURPS.

* The game has UI enhancements for keyboard and mouse, including double-click to move items in inventory, tooltips for items and NPCs, and more.

* Atom is also the name of a programming language developed by GitHub that allows users to create their own text editor.

Regarding your request to download ATOM RPG for free on Apple devices:

* The game is available for download on the Mac App Store. You can search for 'ATOM RPG' in the store and purchase it.

* Alternatively, you can check out online platforms like GOG or Itch.io, which offer DRM-free games, including ATOM RPG.

If you're experiencing issues with CPU usage on your M1 MacBook Pro, I recommend checking for software updates and ensuring that your system is running the latest version of macOS. You may also want to consider adjusting your system settings or closing unnecessary applications to free up resources.

As for switching from a 15-inch MacBook Pro to a 13-inch model, both options have their pros and cons. The M1 chip is a powerful processor, but you may need to adjust your workflow to optimize performance on the smaller screen.

Finally, if you're looking for more games to play on your Apple devices, I recommend checking out the Mac App Store or online platforms like Steam and GOG, which offer a wide range of titles. You can also try searching for 'free games' or 'classic games' to find some great options.