I'm not usually into this genre but I found this really fun. The sound and particle effects in particular were really great! It's so satisfying when you hit something and they pop and then explode into fireworks! The music track is also killer and everything audio and visual is just slick as hell.
Theme use was clever, it was tricky to get used to facing the other direction that I'm used to, although I'm not sure it changed the gameplay or strategy in a meaningful way (since you're still shooting at them and they at you). Still the polish on this is perfect and the animal designs are really fun and have a lot of personality!