Sector Space is a single player sandbox top-down 2D space game with retro graphics. The game takes place in a procedurally generated world. Each world represents a single galaxy in the void.
Characters pilot their own ship and depending on the chosen character class (profession) may have up to 6 fleet ships. As the character levels up they may select various secondary skills to further specialize and improve their ship. Skills are automatically passed onto your fleet ships but at a reduction proportional to their level. The primary means of upgrading and progressing is through selection of gear and ships of increasing tier level. The game contains hundreds of items which may have modifiers applied enhancing their function. 
The character's ship and fleet can be moved between world files allowing you to generate different "galaxies" to explore. Most resources are renewable so typically you only need to play on one world. Some locations are unique and present in all generated galaxy although their position may change.
A world (galaxy) is divided up into a grid with each cell being a "sector". Characters can move from sector to sector continuously or take advantage of jump drives, jump gates, and wormholes to move larger distances. A sector can be an entire asteroid field, star system, nebula etc. There are combat areas and anomalous regions with more challenging enemies and better item drops. The character may be visited by NPC or ambushed in a random encounter while they move through dangerous regions of space. Make use of NPC stations and resources to progress, additionally characters may deploy their own stations and fortify the area with drones to protect against hostile invaders.
The typical game loop consists of levelling and acquiring gear through combat or gathering resources and crafting items which will also grant experience towards levelling up. Players can mine asteroids, refining the ore into pure elements and then craft components which are used in the construction of items and ships. Additional resources may be extracted from planets and colonies. Item's can vary in price by region and fluctuate over time which can make trading between stations a viable source of credits.