Cool little game! For some reason the first time I played it the sprite for the boss at the top didn't show up, so I just had to keep shooting around until I saw the health bar drop. I would've liked to see the drills be a bit more effective as well, I didn't get hit a single time and I went pretty slowly. Still, the sprites are awesome and the visual style is great. I like the idea of being able to climb on the walls and stuff and the boss sprite was super cool and made me wonder about the story of it all. The music is a good moody touch, but it didn't loop which might be something to fix. Other than that well done!