This is not my kind of game, so I approached it as "I'll play this when I'm particularlyu tired and can't handle a brain-intensive game". It worked perfectly. The amazing graphics of the game, coupled with the interesting upgrade system, without being hard and with the interesting plot, makes for a game that doesn't expect your full attention but it's also engaging. This ensure you keep playing it and at the same time ensures I don't want to rush it, so I still have my "relax time" when needed.
The game overall is nice. Especially the flying and the combat feels really good, in some occurrences I think it's deeper than Ace Combat. However, where it fails miserably (and the reason for 3 stars) is level design: there are ENORMOUS amount of enemies and with how the AI behaves, you are essentially forced to clear the area of trash mobs and taking over the more interesting targets afterward. You are free not to do that, but a mission can easily take 40 minutes due to the amount of targets you are assigned and there are no checkpoints. So yeah, one mistake and you'll need to restart from scratch, which is extremely frustrating. I love what they have done, but halving the target in each mission would have done good to this game.