I already made a more complete comment on the jam page, but for peoples not interested in FIST but in super hero game :
Super is a game about heros, they have to put back the mask in a world that made their actions unlawful. The base mechanic is based on fist, which ressemble the base of pbta with 2D6 and a partial success mechanic. The base game include 36 powers, 18 origin and 12motivation, in easy to use array, allowing to create new character for the two to three sessions that it will take to beat the vilain, which your game master can generate (with plot and power ) with more array !
The game is still in play testing, so only the rules are available, and (as you can read above ) one of the main thing in the rules is the beats system that make progressing your character on narrative goal instead of the classical XP. It's already an idea in FIST (in which each character has a goal that define how it advance ), but in SUPER your motivation and origin define what you do to advance and what you gain when you advance.
All of this prelude to a very good ttrpg, and I'm waiting for the complete version, which I hope will include some lore about the world of SUPER.