The tower defense genre has grown stale. This is nothing new. There isn’t much to expand on in a game that’s only requirement is to build towers to defend things. Studios have tried to cash-in on the genre by adding small novelty mechanics or interesting visuals and while some of these have translated into pretty good games, the next one immediately eclipses them. It’s been so overdone that the bar is now incredibly high.
Anomaly: Warzone Earth expanded on the idea of tower defense by including tower offense, something that is just as refreshing as it sounds. Instead of just planting weapons at strategic places on the map, players must also plan predetermine a path of attack and protect their units from “enemy” towers. Even in the newest installment, Anomaly 2, it plays out as something interesting and complex, having even seasoned players sometimes trip over themselves at the start.
I was recently able to play through the Anomaly 2 beta which included a single-player tutorial with three missions that end in a foreboding and abrupt cut and the online multiplayer, so I can’t comment on more single-player or story modes.