Cool game, some way to improve would be more sound fx, particle effect, having a collision that slip a bit when colliding with other, you should explain the circle (or miss something in the tutorial) because at first i was "ok i will slain everything" and didn't understand at first (it's a little detail), a little animation when the computer get jammed.
Very good vision of the theme. Overall, i had fun and i finished the 2 levels.