Games like Space Castle

If the competitive and replayable rhythm of Space Castle stuck with you, this helps. You will find a few strong contenders among these games.

Space Run
A real-time spaceship construction strategy game with a twist on tower defense: you are a space courier hauling valuable cargo through asteroid fields and pirate ambushes, building your ship as you fly. Fast, tense and endlessly replayable, with a dry sense of humour to match the danger.
Replayable
85% of 1,774 Steam reviews are positivePlayers online now: 1$4.99
Solaris
Discover a space strategy game filled with conquest, betrayal and subterfuge. Build alliances, make enemies and fight your way to victory and galactic domination. Will you conquer the galaxy?
Competitive, Replayable
81% of 90 Steam reviews are positiveFree
Space Reign
An indie space-sim and strategy game featuring ship and fleet combat mixed with RTS elements. Complete contracts and Claim sectors for your faction in the near-future, where resource exploiting corporations are in a state of constant conflict over territory control.
Replayable
73% of 453 Steam reviews are positivePlayers online now: 4$19.99
Nova: Space Armada
An exceptional sci-fi strategy game based on space adventure as its core.
Competitive, Replayable
51% of 283 Steam reviews are positivePlayers online now: 97Free
Spaceship Commander
Fight in space or on the planets, or just travel the universe. Visit cities and buildings, mine resources, trade with or speak to individuals on the planets. Explore and discover. Buy a new ship, fit upgrades, and hire a whole army of crew!
Replayable
60% of 20 Steam reviews are positive$9.99
Gratuitous Space Battles
The first ever auto-battler game, from way back in 2009Who needs backstory? Who needs resource-gathering? Diplomacy is so last year. Gratuitous Space Battles cuts right to the chase of sci-fi strategy games, and deals with large, completely unjustified space battles between huge opposing space fleets.
Competitive, Replayable
72% of 569 Steam reviews are positivePlayers online now: 6$14.99
Stellar outpost commander
Real-time strategy game with commander task control. Pilots-Mercenary, each with their own character, and many unique ships for them. Interesting missions. Base development, various technologies and space exploration.
83% of 29 Steam reviews are positive$8.99
Starpoint Gemini Warlords
Fly a gunship, end up ruling a star system. Starpoint Gemini Warlords puts you in the captain's chair of your own warship while you build fleets, conquer territory and grow an empire across Gemini. Lead the charge yourself or let your armada do the work, then do it all differently next time.
Replayable
72% of 3,078 Steam reviews are positivePlayers online now: 11$34.99
STARSHIP
In the game, you have different spaceships and 13 different skills. Gain money, parts, and skill pieces in victory and create your own ship skill set. In combat, anticipate your opponent's actions, avoid his damage, allocate energy properly, deploy skills, and push him to his death step by step.
Competitive, Replayable
64% of 14 Steam reviews are positiveFree
rymdkapsel
Build a space station. Command the tiny crew. Explore the galaxy. A meditative space strategy game.
81% of 230 Steam reviews are positive$7.99
Fortified Space
Seize control of hostile planets in this nostalgic space sim and tower defense hybrid inspired by classic Flash games. Fight for orbital supremacy in starship combat, then land on the surface to build bases, deploy defenses, and shred enemies. Relax aboard your ship with farming, mining, and more.
Replayable
100% of 4 Steam reviews are positive$3.99
Ancient Space
Ancient Space is a story driven single player real time strategy game where you take command of a fleet embarking on a scientific mission to chart undiscovered reaches of space called ‘The Black Zone’. Overcome overwhelming odds and fight for your life and the survival of your ship and its crew.
42% of 273 Steam reviews are positive$19.99

Cheaper than Space Castle

ROD: Revolt Of Defense

Explore a random generated space. Find artifacts and treasure maps. Build and develop your base on a flying platform.

$0.99

SPACECOM

SPACECOM – a strategic-to-the-bone, starfleet command game in which deception, smart movement, and choices to battle decide victory or defeat.

$1.39

Deep Space Battle Simulator

Two teams of players control their capital ship in an epic battle.

$1.99

Into the Void

Into the Void is a strategy RPG and exploration sci-fi game with an epic story and intense battles.

$1.99

Space Crew: Legendary Edition

Run a starship under fire, juggling engines, turrets and fires while losses send fresh recruits straight into the fight.

$15.99

Space Cycle

Space resources are the battleground for warring factions. As a Space Defense Officer, protect your faction's assets in a vast, hostile universe.

$1.99

O.R.B: Off-World Resource Base

An epic struggle for control!

$0.79

Interstellar Pilot 2

The hit mobile game Interstellar Pilot 2 has come to Steam. Join the TEF forces heading to the Gatopean sector to find a new home for mankind.

$0.99

Strength In Numbers

Take back control of the galaxy and defeat the evil AI in this fast-paced, node-based strategy game.

$2.89

Plancon: Space Conflict

Damn aliens! The choice is: the Universe — or nothing!

$1.04

Space Break

Build ships from elements and go to fight. The player can control several different spaceships at the same time (fleet battles).

$1.99

Element Space

Year 2199. Assemble an elite crew and make allies to combat a shadowy organization threatening the future of humanity.

$0.99

Hidden gems like Space Castle

Space Reign

An indie space-sim and strategy game featuring ship and fleet combat mixed with RTS elements.

$19.99

Cosmoteer: Starship Architect & Commander

Design every deck and turret of a starship, crew it with simulated people, and take it into battles where damage tears your work apart piece by piece.

$19.99