Simple and challenging game, you basically have to shoot the bosses that are in the center of the level, however, you have a limited amount of bullets and you must collect them to be able to beat the bosses.
The chosen soundtrack is interesting, however, in more advanced bosses (which by the way have 3), the attacks of the bosses are more frequent... this includes the sound of the attacks... in short, it is difficult to hear the music :( .
Apart from this detail, the game is beatable and pretty cool (even with the absurd frequency of attacks from the last boss O_o).