I had a good start, but then more enemies started rushing us and my troops would either keep missing or just watch as enemies walked right past them and down the bottom of the map.
The 2nd motorcycle part didn't take me too long, thankfully. It's just annoying trial-and-error memorization, which is a recurring theme in this series.
Lol this game becomes completely unplayable if you die once. Your gun just won't fire and you can't switch weapons. All you can do is watch as your walls get overrun and the survivors haul ass out of there, leaving you behind as a distraction. Play it, die, then just skip to the second game.