Great job with this! The flashlight/shaking mechanic was creative and worked well, and it provided for some nice gameplay/enemy possibilities. The timed phases also worked well and the ripple that goes out when you get hit was very cool. I also liked how the boss had multiple phases and the particle effects you put in there. I made it as far as the stage before the boss, but when I ran out of lives and had to start all over it did feel a little disheartening. I came back later, though, and played to the finish. It was fun, nice job!
The most salient area for further development for me was the colliders on walls/platforms: there were a few points where you had to jump quickly up stair-step type walls, and the walls were sticky. This disrupted my jumps when trying to avoid projectiles, and I also got stuck on walls and went off-screen as the screen moved from left to right a few times.
This game was fun, great work!