Voices of the Void a free (likely while it's in pre-alpha) light simulational game about receiving outer space signals and recording them to sell. You use the currency to clean up, upgrade, and decorate your small facility while moving around the Swiss forest valley you're in to repair and upkeep the satellite dishes that make the operation function.
It sounds very purely simulational, but there are a lot of secrets and interesting signals that are more than signals. It's also an Unreal engine game, but features a lot of Source engine love, for example the art style is reminiscent of Half-Life 1, all of the sound effects are EXTREMELY Source game nostalgic, and there's crouch jumping.