My current GOTY, Clair Obscur: Expedition 33, has Acts and Epilogues that keep topping each other as you move through the story, ultimately culminating in endgame content that you really need to play, as it A) also has some key story things and B) is a lot of fun.

What makes Sirene one of the hardest bosses in Clair Obscur: Expedition 33 is her long attack strings; some have timing differences, while others require multiple defensive methods. For example, her Grand Ballet move has its final attack strike after a bit of delay, so if you're following a rhythm, you'll probably miss the counter and take damage.

While regular post-launch updates are to be expected, there is one major gameplay addition that Clair Obscur: Expedition 33 needs very soon.