It's an excellent 2D fighting game. The fights went pretty fast and unless you know your character, it's hard to know what you are doing. However, once you mastered the controls of a character, fights became really intense where your reactivity is brought to its limits. Moreover, it's a trully beautiful games, using japanese manga style graphics (which I love). Musics, voices and sounds are also good and manage successfully to instaure a good atmosphere.
I must insist on the fact that it is a hard game, a VERY hard game, and it is really pleasant to see one which can resist you because those games are really rare nowadays. But, this statement is also a drawback as, in hard mode, the final boss is sincerely unbeatable (I only manage to beat him twice in more than 10 hours of playing). This is the main flaw of this game : its final boss is just going to drive you mad. I do not understand the interest of setting a boss like that, because, that character aside, there is really a good balance between the different fighters. But, Hilda, the final Boss, she is definitely broken. Of course the final boss is powerful, but it should not be that much. Fact is she can attack you from distance instantly and without any pause. She can also teleport when engage in hand-to-hand combat. So, I do not know how the IA of character is made, but she will keep spamming lasers and explosions without any delay from the other side of the arena, and if you manage to get close, most of time she will teleport instantly.
Appart from having hulk as a boss, playing Vanguard Princess is very refreashing and amusing. Combos are well thought, and the game has a good lifespan. An excellent game for a small price, I encourage you to buy and play it (I recommend you to play with a joypad because some techniques are very hard to make using keypad only).
8/10 according to me.
PS : if you want to see what the boss is really capable of, buy the DLC ;)