A batch file outside of the game directory is certainly interesting..
But I really like the music. Particles are a little overdose, fits the theme perfectly!
I really like these kinds of games. This one could really thrive from a little polish. I should be able to click on upgrades, characters could be bigger.. Aiming with the direction you're moving is.. interesting.. It's a good thing you change up the music too. Really fun and has depth though.