I don't have Frozen Synapse yet. It's one of the games that slipped through during a time I was too busy with work to consider it (or anything else for that matter). But to anyone who is wondering what to do with this bundle, let me tell you:
Frozen Synapse is a great game. If you were ever a fan of tactical squad games the likes as XCOM, Jagged Alliance or Falllout:Tactics, Frozen Synapse is a must-have indie title for you. I'm not even surprised it comes alone in this "bundle". It's worth a sleuth of indie games on its own.
PC Gamer did a good review on it
here. The game had raving reviews and I totally recommend it. What you shouldn't expect however is a good AI. Despite the single-player component, this is a game to be played in multiplayer mode. And it's be said to be loads of fun, with a single game taking days to finish if you are serious about it.