Do you like tower defense games? If you said yes or sometimes, you should check out Red Invasion: TD Blitzkrieg. Red Invasion is yet another quality game from Milkstone Studios and a solid tower defense game for only a buck. If you said, "What's a tower defense game?" in response to my question, let me respond with my own question: How's the rock you've been living under? But if you really don't know what a tower defense game is, just watch the video below and you'll get the gist of what makes up the strategy sub-genre.