Disclaimer: I encounter many of these systems for one-shots at meetups, where I sometimes won't even know what I'll be playing going in. Because of this, I'll often only have taken a deeper look at parts of the book that relate to character creation, and flipped through the rest. But I'll always have played them!
Classic Snake with AT Protocol OAuth login and high score saving to your PDS.
A simple Godot 4 C# platformer made collaboratively.
A simple, beautiful meditation on life, death, and purpose.