Games like Solar Lander
Games like Solar Lander include Kerbal Space Program, Astrox Imperium, Mountain, Plague Inc: Evolved, and Game Dev Tycoon. We matched them by the tags players give Solar Lander on Steam (Indie, Early Access, Casual, Simulation, and Space): closest matches first, and among equally close ones the better-known games.

Kerbal Space Program
Shared: Simulation · Space · Indie

Astrox Imperium
Shared: Early Access · Indie · Simulation

Mountain
Shared: Indie · Simulation · Casual

Plague Inc: Evolved
Shared: Indie · Simulation · Singleplayer

Game Dev Tycoon
Shared: Indie · Simulation · Casual

Spaceflight Simulator
Shared: Simulation · Space · Space Sim

Universe Sandbox
Shared: Simulation · Space · Space Sim

FTL: Faster Than Light
Shared: Indie · Space · Singleplayer

Master Of Pottery
Shared: Indie · Casual · Simulation

SpaceEngine
Shared: Casual · Space · Space Sim

Paralives
Shared: Indie · Simulation · Singleplayer

Papers, Please
Shared: Indie · Simulation · Singleplayer

Kinetic Void
Shared: Indie · Simulation · Space

Universe Sandbox
Shared: Simulation · Space · Indie

Passpartout: The Starving Artist
Shared: Indie · Casual · Simulation

Space Engineers
Shared: Space · Simulation · Singleplayer

Startup Company
Shared: Simulation · Indie · Casual

Solar 2
Shared: Indie · Casual · Space

911 Operator
Shared: Simulation · Indie · Singleplayer

Cosmoteer: Starship Architect & Commander
Shared: Indie · Singleplayer · Space

Mini Motorways
Shared: Casual · Simulation · Indie

House Flipper
Shared: Simulation · Singleplayer · Casual

Potion Craft: Alchemist Simulator
Shared: Simulation · Singleplayer · Indie

Empyrion - Galactic Survival
Shared: Simulation · Space · Space Sim