Games like The Red Reactor

"Colony Survival is a historical simulation game that offers both single-player and multiplayer/co-op modes. Players must build and manage a colony with dozens of different jobs and resources, while defending against monster invasions using dynamic 3D pathfinding. Explore a large, diverse world and expand your colony with advanced metals, weapons, and jobs using an extensive science system."

"Grim Nights" is a top-down, open-world survival game set in a post-apocalyptic world. Players must scavenge for resources, craft tools, and build shelters to survive against the harsh elements and dangerous enemies. The game also features a day-night cycle and dynamic weather system, adding to the survival challenges. However, please note that the game is currently in Early Access and may still have some bugs and unfinished features.

"Rise to Ruins" is a godlike village simulator that combines elements of real-time strategy, tower defense, and survival games. The objective is to build and manage a village, facing brutal survival conditions and learning from each failure to improve in subsequent attempts. The game offers three modes: Survival, Sandbox, and Peaceful, with Survival being the intended experience.

Vectorio Classic is a survival base-building game where you gather resources, research advanced weapons, and strategically expand your base to withstand waves of enemy shapes. Players must balance defense, power management, and logistics to survive and defeat four powerful guardians. Cooperative multiplayer adds an extra layer of challenge and teamwork.

"Rise to Ruins" is a godlike village simulator that combines elements from classic real-time strategy and resource management games, with twists of tower defense and survival. The objective is to manage a village, defend against monsters at night, and expand during the day, with the knowledge that failure is common, but provides learning opportunities.

Tower Factory is a game where you have to build a factory that allows you to create enough towers to defend yourself from enemies. You'll need to find and destroy the enemy castle before it becomes too powerful and its monsters overwhelm you! Features: Constantly build, expand, and upgrade your factory. Acquire resources to build more and better towers. Explore the map to locate the enemy…

Dawn of Man is a survival strategy game set in the Stone Age. You lead a group of early humans, helping them develop tools, establish settlements, and ward off threats like wildlife and rival tribes. Over time, your group will progress from nomadic hunter-gatherers to established farmers and city-builders.

"The Last Haven" is a post-apocalyptic survival game set in a world devastated by nuclear war. As the leader of a settlement, you must provide for your people's basic needs, manage resources, and maintain morale while dealing with challenges such as low temperatures, radiation, and potential attacks from marauders. Your decisions and management skills will determine the survival of your people in this harsh environment.

In "Diplomacy Is Not An Option," players step into the role of a minor lord forced to fight overwhelming odds to survive, with over 25,000 enemies attacking their castle walls. The player must master engineering, economy, and even magic to have a chance at survival, while dealing with a demanding king and rebellious peasants. This intense strategy game offers a unique and challenging warfare experience.

"Flotsam" is a survival simulation game set in a post-apocalyptic world where players manage a floating village made of debris. Scavenge for resources, adapt to the changing environment, and discover remnants of the old world while ensuring the survival of your community. The game offers a unique and immersive experience, challenging players to create sustainable habitats on the unforgiving sea.