Such a creative mechanic! Got the hang of it pretty quickly and was a fun experience!
Really loved the main gameplay---especially the behavior of the enemy AI(I never figured out how to do a good enemy ai). Gives a nice amount of challenge to the game overall. Also, really enjoyed all the pixel art:) One small suggestion about the art is that maybe the lighthouse could spin without pixels rotating(But of course I have no idea how to implement and this is already great for a 3 hour jam).
A small issue I found was that the player seems to be getting stuck on the lighthouse's walls sometimes. Changing the movement function or removing friction could help.
Great job:)