For me the idea of a hybrid tower defense game is also new. Therefore, it is very innovative for me. Sev Zero is nicely decorated (graphics and game play). About the Air Support app a second player can even help.
It is a core from the ingress of monsters, the one with the set up of automatic guns, as well as through its own firepower with many primary and additional weapons to protect.
Due to the excellent price / performance ratio (no costs and already has three full nights game) I must give five stars here. Would not free the title, I would like to pay the 5.49. Sev Zero is worth the money. (Would receive 4+ star, so it is still being developed).