Really good game. It may be unoriginal and all, but you kill a shitload of people, which is good.
I'd recommend the next game to be longer and have more varied levels, not just a small space with two houses and some planes. And some variety in the people would be good too.
Level 4 can be quite hard, but the boss isn't. Just keep using the beam to pull cars and the ball he throws, then hit him with it. When he leaves the screen limit, beam up all the agents so they won't bother you.
The boss is too hard to beat if you fight him normally. I doubt anybody can defeat him without go through the same level countless times to level up (or use some strategy that only works because te IA is dumb)