Summary: I love comet crash, one of my favorite games. It is missing online multiplayer but I rate it a 10 because it is amazing and ita graphics are great. I Would not call it a tower defence because tower defense reminds me of one of those crappy flash games on a computer.
Summary: The good: 4 player couch co-op!!! Good tower defense, a lot of depth in some levels. The bad: too many stupid levels where you have to do one thing very fast, some levels can be annoying. Game can get repetitive.
Summary: Simply a good game with GREAT gameplay that really engages the mind. Its true that the offensive element added to the game adds a lot more depth than you might think. At first its a tower defence game but suddenly you realise that defence won't win you the game so you begin building your army in...
Summary: What sets this tower defense game apart from many others is it forces the player to decide between offense and defense while also managing resources to pay for those efforts. Not quite up to par with Pixel Junk Monsters, but a really engaging and fun game.