Surprisingly addictive
I really enjoy this game. Why? Nice, clear graphics, good physics, interesting concept and weapons do not make you almighty. I liked the variation between levels in particular, some of them were really intriguing and they kept my interest till the end.
One thing I did not like very much:
The music, I guess this may be just my taste but I think that the rest of the game is of higher quality ;)
The second problem: only 30 levels, I would reaaaly like to see more ;)
Overall great work, I am hoping for a sequell soon.