Nice use of the assets, I liked the visuals!
It was pretty satisfying but I think it could be even more satisfying with more player feedback. The explosions are nice (a little too much screen shake, it should fall off with distance from the explosion) but adding that touch to everything, like when the player is hit by a bullet or crunches on a human, would be really great. Also would be nice to be able to plow through buildings and the laser should have some sort of noise too.
I liked the little tutorial in the beginning. A high score could be used to give the game more meaning, something like damage value.