I think this is one of the greatest science fiction point-and-click adventure games you could find on steam. It's got old school pixel graphics and just great voice acting all-around. The puzzle elements are also a lot of fun. The story behind Gemini Rue may seem derivative. It's set in a universe like the TV show Firefly and it's movie counterpart Serenity, it has the tone and feel of Blade Runner and has the plot of Total Recall. But it never made it bad. It's just taking the good stuff on what I like about science fiction.
You play as Azriel Odin, an ex-assassin that is looking for his brother on the planet of Barrucus, which is part of a Gemini Star System, a system that won it's independence after a war and is now run by a crime syndicate known as the Boryokudun. The other character you will get to play is Delta-Six whom is a patient of a mysterious facility. This is all I can say about the story without going into spoilers.
Throughout the game, you talk to characters, solve puzzles, do detective-like work to learn about things and occasionally go on shoot-outs. There's an interesting shooting mechanic in the game that you will learn how to use.
All of the characters in Gemini Rue are well written and feel real. The philosophical themes of identity and memories are also explored in this game and is pretty much what the game wants to explore and talk about. There are a couple downsides of this game. Some of the puzzles are little too difficult and the fictional universe that is offered in Gemini Rue remains mostly unexplored with the exception of a single city on one planet and a facility somewhere else.
But I recommend this game to Science fiction, cyberpunk and story adventure fans. It's definitely a must-buy!