Frozen Synapse is a game about raw tactics and learning from your mistakes.
Frozen Synapse is an asynchronous turn-based strategy game that puts heavy emphasis on strategy over probability during both single player and multiplayer matches. The game bares down to the raw basics of a strategy game while keeping elements of strategy that make the game absolutely splendid to keep playing even when you've struck out hard against your opponent.
The game features mechanics based around unit positioning and planning your actions via the simulation feature (a mechanic in game that allows you to run a simulation of what would happen if certain units moved around the battlefield) where a well planned move could win turn the match in your favor or conversely cause it to slip from your grasp.
Units in combat are rather simple to understand which makes them user friendly with a bit of practice. The interface is very user friendly (although it might be a bit overwhelming at first since there are a fair bit of options to choose for a unit).
The Red DLC adds an additional single player campaign, additional songs for the soundtrack (which is phenomenal), and a unique unit that can change a match if used correctly.
To summarize: Frozen Synapse is a phenomenal turn-based strategy game that will attract the attention of almost anybody looking for a strategy game based around tactics as well as those looking for a good multiplayer game that also happens to be a strategy game.