Great entry! The game is very polished, and has a great take on the theme. Love the music and art--you've captured a vibe perfectly, and I love it. I'm not a big fan of action games, but I really enjoyed playing this.
Some quick feedback--movement feels very sluggish, and it doesn't mesh well with the fast-paced music. It wouldn't need a huge change--just a little more speed and responsiveness, and it would feel like a much higher-energy game.
Being able to speed up dialogue would be nice. I ended up skipping the cut scenes because they were taking too long to display, and the unskippable dialogue at the beginning of fights made retrying them a little tedious.
On the second boss, the crosshairs should stop moving once the boss has locked in on its target--it's too hard to tell if you're out of the danger zone.
Overall, though, this is a fantastic game, and all the more impressive for being made in a month. Amazing work!