itch.io

Typically refers to a style of game where a player's ship can rotate 360 degrees on a 2d plane and is responsible for shooting and destroying on coming asteroids. The asteroids start out large, but divide into smaller obstacles as they are damaged. The game becomes more difficult and chaotic as asteroids are broken into the smaller pieces.

Games which have short playtimes and can usually be completed in one sitting.

Games that can be played alone

The larger universe outside of Earth's atmosphere. Sometimes really, really far outside of it.