I'd like to ask for advice on Mission 2. It is by far the hardest mission for me since the worms are homing on to me T-T what's the strategy there?
Typically I finish that mission with either the autocannon or thermal projector. You need to keep moving at all times and watch your surroundings so you don't get boxed-in. It's best to wait until there's a large amount of them swarming together so you can take them out with minimal ammo usage. Smoke grenades are also handy for slowing them down and making an escape when you're in a tight spot.
Also, what's the highest score possible? I've only ever got A+.
The highest score you can get is an S rank. For now the score is calculated by number of hits taken and your mission time. If you finish it under 2 minutes with just one hit taken you should be able to get an S, once you go over five or sustain more than a couple hits it will start to detract from your end score. Eventually the mission objectives will vary from just destroying all enemies so there'll be other things affecting the score result, but for now it's just those two things.
In any case, this was a really fun game, and all the little details like sound and destruction animations are *chef's kiss*. Hope to see more of this!
Thank you! More to come.