For fun, I’ve written some role-playing game adventures and designed a few games.
Role-playing adventures include “Prison of the Mad Gods” for Dungeon Crawl Classics RPG, and “Apex of Life” for Trail of Cthulhu. If you’re familiar with 13th Age, here’s a version of its 13 icons made for space opera, along with some notes for building your own sci-fi galaxy: 13 Icons of Space Opera
Games include Daedalus, a fast-paced 2D race/maze-building game written for Flash Player (back in 2011!), and rules for chess variants: Zombie Chess and Alien Chess.