I was actually a little surprised at how much I enjoyed this game.
It has a lot of things in its favour. The story, while not exactly the next Great American Novel, served adequately as backdrop for the action and most of the characters have enough personality without being obnoxious. The visual style fits the concept very well, clearly influenced by the same alternate history comic the main premise is based on. The air combat and cover based shooting mesh surprisingly well and I found switching between them to be fairly smooth and intuitive.
I did read some other reviews mentioning that the air game was hard to control, however I believe this is because the game was designed to be played with a controller. By realising that fairly early, I had no problems at all. In fact I found that the whole air game felt particularly "good". You can buzz around with your jetpack, take over enemy aircraft, hop into friendly AA turrets and seamlessly move between flying and hovering. Note that the game doesn't really tell you to do these things though, I didn't even realise I could take over enemy ships until halfway through. Still, it is small optional elements like this that sold the game to me. In fact, I was impressed enough that if someone told me these developers made an open world game using the mechanics demonstrated here, I would probably throw some money its way.
Naturally, it has its flaws. Chief among which that the game is rather short and a bit random at times, most likely because the developer was more ambitious than its wallet allowed. There are some signs of separate segments of the storyline being Frankensteined together in an attempt to keep things coherent after money ran out, but all in all this won't bother you much and I felt that a good job was done all things considered. At least not until the very end. There the game ran out of steam and threw in two bossfights in quick succession that obviously were only thrown in because it is what was finished. Oh well. Bigger titles have done the same with less excuse.
Another issue I had was the placement of the checkpoints, which were not always properly spaced. There was a defend section I had to do over a few times because I failed a quicktime event and died instantly. Yes, the game has quicktime events. That's another minus. A minor saving grace there is that they are short, sometimes optional and, in the case of one particular hostile, even allow you to choose which quicktime sequence you want to do by picking between two different prompts.
My final grievance is the upgrade system. The game has you collect points to upgrade your weaponry of choice with, allowing you to hold 2 weapons at a time. Upgraded weapons are vastly superior to non-upgraded ones, meaning you'll often stick with the ones you upgraded instead of picking whatever would objectively be a better weapon for the situation. It is here that the game is also a little bit schizophrenic. On the one hand, it allows you to steal the weapons your enemies use if you run out of ammo. However, ammo packs and chests are plentiful and dying resets you to your last checkpoint with full ammo regardless of how much you had when you passed that point. In addition to that, you'll only find enough points to upgrade 2 or 3 weapons properly, further encouraging you to really just use whatever you picked as your first upgrade choices for the entirity of the game and killing off what could have been a good way to add challenge to the game.
Still, maybe it was because was I going through a backlog of generic shooters at the time and had low standards going in, but I really am glad I picked this one up. It impressed me enough to write a review at least and I really only do that for games that leave a mark in some way.