As someone already said the best way to get through the game is by partly avoiding it's main mechanic. The item switching is a good idea, but felt to me more like an anoyance than something I would try to plan for and incorperate into my play. I think it would be interesting if the beat of the metronome would have had consequences for the rest of the game, like enemy movement, weakness or attack patterns. Because then one would have to plan how, where and when to move, attack.