Cave story is an all-time favorite platformer of mine, but as someone who loves 100%ing and achievements, I'm frustrated with games who do 'one last big level at the end that's not technically necessary but is obscenely hard'. I hated it in Mario 3D World and Odyssey, and I hate it here. I consider myself good at video games, but when the stretches are that long without any sense of reprieve it's just.... not fun, at all. Anyway, this is still an all-timer for me.