I like the music in this game. It would be better if it could be played in full screen. There's a long wait before enemies appear when entering each room, which seems pointless. I think it would be better to make enemies appear immediately upon entering a room. Also, the game balance isn't very good; after picking up a few attack speed boosts, I was practically invincible. Regarding the gameplay, adding some screen shake when firing and hitting enemies would make the rock music feel more pronounced. Well done!