This is insanely addictive! Brimming with personality in terms of the graphical style and types of sprites used. The music is really compelling as well. Normally this kind of bass-y beat music isn't my thing but it's used very well as a way of building tension as the game goes on; I really like how it increases in speed and intensity along with the game speed because it gives a Space-Invaders-esque tension to it.
Added to my favorites, great work, everybody! :D