There's a couple of things that I'd like to point out:
1. When replaying missions, the level select menu tracks your most recent stats instead of your highest overall stats.
I believe that the highest overall stats should be displayed instead, because I managed to achieve an A+ rank on the second mission, but when I decided to replay it, I achieved a lower rank and that's now displayed on the level select menu instead of my previous rank.
2. This is a nit-pick, but for the user-interface, the thermal projector should say fuel instead of rounds.