Symphonia might scratch your Silksong itch, even though it's not a metroidvania
In "non-violent and poetic" 2D platformer Symphonia, you're an extremely fancy violinist exploring a realm of musical machines, where gas lanterns kindle fitfully as you approach, crotchets adorn vast cogwheels, and reams of what I really hope isn't actual catgut feed through titanic pegboxes overhead. Sampling the demo, I was immediately enflamed by the orchestral score and placed in a mood of white-gloved sophistication only slightly spoiled by the familiarity of the underlying platform moveset, and by my repeatedly falling into pits.