I first tried Dustforce when I got it in a Humble Bundle over ten years ago, and again when Matthewmatosis recommended it, but I didn't play it thoroughly until now. Its precise platforming is as deep as something like Celeste, but it lacks any story or character-progression to push you forward (more like OlliOlli). To really complete any level is to play it nearly-perfectly. There is a lot to learn and practice, and levels are gated by obstacles that can only be overcome once you've figured out the nuances of the mechanics. The leaderboard shown at the end of every level beckons you to play even more perfectly for speed. Those processes are the meat of the game, skill-development as play; see racing, fighting, and character-action games. That few games are as willing as Dustforce to cut out the cruft and to intimidate the player in the process is not a criticism. But without some kind of context like a narrative, the problem with mechanically deep games returns: why develop your skill for a video game when you could so for another hobby and get more out of it?