Found the way the gun worked a funny way of using the 2nd theme though I feel like the use of the other two themes could be stronger.. interactively anyway.
Anyways, I liked how I ended up being extra careful about my shots against the hordes that would pour out at me since I wanted to avoid death by ricochet. Doubling the rate of fire would, I feel, compliment the gameplay a lot.
Animations were really nice to watch too!
Nice submission!