Loves the first game. This is infinitely better. A proper horde mode esque game with some tactics built into the higher level difficulties.
Air support feeling is amazing when it hits the enemies, also pretty funny when it's a bit too much danger close and wipes out your entire squad!!
Difficulties make a massive difference too. Nice and casual at lower levels and properly intense at the higher end. A question of picking your poison relating to what you want to get out of it.
Best game I've played in ages and is most defo going to get me back online!!