Yeah this game length thing is crazy. I played Stellaris for 400 hours because I really wanted a space grand strategy game, despite it being obvious fairly early that this was not the one. A Short Hike, on the other hand, is a near perfect videogame, which I finished in one evening.
But neither made my list, because my criteria include both love and importance. So Stellaris was neither and A Short Hike is only one of those things, I suspect. Whereas Bloodborne is both a landmark game of the decade, and my favourite game of all time.