The Riftbreaker is a unique mix of several different genres. Simplistically, it's a base building tower defense game with some light factory elements and resource management. You mine resources, build a base, power it, and defend it from waves of creatures while you try to build a huge rift gate back to Earth. There's a 30 hour campaign as well as a survival mode and it should have a decent amount of replayability. The level of polish and content really sets it apart from competitors though; right from the beginning it's well voice acted, animations are really smooth and it's very easy to get into. If you enjoy base building, definitely give it a go.