Welcome to the world of modern metroidvanias. Hollow Knight is a great game and has probably the best ambiance and art style of any of the modern metroidvanias. I would also recommend:

• Bloodstained: Ritual of the Night (I personally loved this one)
• Ori and the Will of the Wisps (theres also the first one that I didn't play)

Some not exactly metroidvanias but good progressive platformers:

• Bastion
• Celeste

And maybe some others I played last year that I can't think of. I will update if so.