I think this had some good ideas, such as the use of the triggers which opened different paths and the hints written in code (good use of the theme). I think they could have been presented in a clearer way though. I feel like the field of view could also be increased, to allow the player to see more of the level.
It would also be good to change shooting to be repeated if the mouse is held down, as there is a lot of shooting, especially for the bosses and it results in a lot of clicking. I didn't make it past the green boss; not being able to see him for most of the fight was frustrating. Some kind of feedback when you get hit, even a noise, would be good too.