Very sophisticated effects/lighting/sound design!
Though it is a very cohesive package for a 7-day project, I am not sure the orb-clicking adds much to the game as it is – with the notable exception of the ‘health’ one, they seemed to feel the same. In a longer project I think it might work better with more ties between the theme of the challenge and the orb defense segments? Undertale’s combat gimmicks would be the most obvious example of tying ‘bullet’ gameplay to other things that are happening, while aided by text and art.