Cool game! The rule switch ups were cool and I liked how the stars were scattered so it forced you to really explore the whole map. My main concerns were regarding the map itself, I couldn't tell what was the foreground and what was the background which left me trying to jump on things with no collision shape. Also, for the star boss thing, I thought it was a clever and "unpredictable rule", but I think it was lacking some sort of feedback when you get hit by it, like a hit flash, sound, or screen shake, something to let the player know they just lost some health. Overall though, pretty solid for a game jam game, you get pretty right to the point and have some clever connections to the theme.