Fun game! Thoughts:
1. The music is great, Tarro delivers again!
2. I love the visuals and the scifi grungy look to the arena, and the enemies look Metroid Prime inspired!
3. Died to the one shot in all but one of my playthroughs, making it difficult to progress to the later rounds.
4. The animations for both gun and enemies is good and crunchy, really adds to the feel of the game.
Overall great fun and great entry! :)