If you're into this kind of games then you really can't go wrong with this one. It has a really nice balance between complexity and accessibility, but once you really get familiar with the mechanics it can get a bit too easy.

Every fan of old-school shooters should check this game out. In addition to the challenging gameplay this game offers an interesting world and athmosphere. The story falls a bit short but that's not the main thing about the game.

Oh and it's PC only, so you can expect slightly better graphics and controls than most multiplat games have nowadays.

A great TD game that reforms the concept of the genre. With the movable towers/satellites the player is required to be active at all times. Also, they hit the spot with the artistic style, and fans of the old trashy sci-fi movies will feel like home.