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There are a handful of games with subsystems that I dig (say, Space: 1889's inventions), or handle certain situations in a novel way (teamwork in Fate), and some systems that I hold dear for altering how I viewed the necessity of game mechanics (Over The Edge), some systems are even considered with what would probably best be described as sentimentality (WEG's D6 from the original Star Wars RPG). But Daniel Bayn's Wushu stands out for giving me the mental permission to run and play the game I had previously only tried to.
This is most obvious in handling things like difficulty modifiers and the other crunchy bits specific to a genre or setting, so the thing that ought to be nifty and engaging, the thing with the most details - often the highlight of the game - actually gets discouraged.
Wushu encourages the actual storytelling, giving mechanical weight to being descriptive, which I like to have at the core of my games.
Most games will have you tell what you do - rather, attempt to do - then have a die roll say whether it happens at all; occasionally this wastes a perfectly good description, or the mechanical outcome doesn't match what would have been the cooler result. Some will get around that by having you check for the mechanical outcome after a general and vague intent ("I take a swing at the guy"), the idea being that you'd describe the specifics to match a die roll. Though it *allows* for description, there's no game-driven reason for it - the goal is that much more within reach without needing to describe your groovy Kung Fu maneuver (or clever method of reading the mark's body language or whatever).
Of course, it doesn't hurt my preference for this system that I like swashbucklers, wuxia, and 1930s pulps, all of which value style over tactics, sheer potency, or (sometimes) realism.
(I seem to have missed a few entries in this "RPG a Day" thing, and I may come back later to fill in the gaps, but I won't give you any odds)
For a decade or so I would've said I never get to play any RPG, but in the last couple of years I've managed to get in on a handful of games - though Over The Edge is something I haven't played since around the time of its original printing.
It unlocked what an RPG could be by giving me the mental permission to get away from "traditional" games; the stories and characters took precedence over things like tactics and mechanical balance. With setting elements referencing Robert A. Wilson, the Weekly World News, and William S. Burroughs, I could run games based on the terrible fiction I wrote in college.
Its influence can be seen in just about any "indie" game these days, as well as many sensible "mainstream" games - so even though I don't play the game itself, I'm still using it.
According to my DTRPG order history, this was one of the things I grabbed during their most recent sale - Imperial Age: Anarchism. It will likely be applied to something Fate-based.