I get so jazzed over these "run around and flip different types of switches with different types of weapons to escape" games, mostly because it was a huge genre for the NES. I was a little tyke when I first started playing these, and they give me the warm fuzzies.
This one was especially clever. Having the missile follow the curser added a dimension of gameplay that I've not seen in a puzzle-shooter, and actually having to move while in mid-flight was a challenging yet "eureka" moment.
The goal when developing these games is to ratchet the difficulty so that it grants the player a sense of accomplishment, but without making it tedious. Out of the genre here on NG, your game manages to very precisely achieve this equilibrium.
Also, nice touch on the ending, especially after what was mentioned in the Bomb note.
5/5, way to go.