Metroidvanias
List of metroidvanias I've already played in the probable order that I've played them.
22 Games
Only played for a little bit, never got to actually beat it.
Some may not considered it as part of the genre because of the lack of items based progression, but I think the interconnected map and sidescrolling action gameplay make it fit into the definition.
Still on my way to beat it 100%, but I've completed most of it and reached the first ending.