Personally, I would run Caravaneer (with or without the infinite money glitch, which you can do by going to the second page of a shop, starting to buy an item, cancelling it, switching between buy/sell tabs, and buying/selling any of the glitched items), or Risk of Rain (with or without the infinite health shrine glitch, providence balance history exploit, mercenary wall glitch) (those are the most rpg-like games I have considered running). But you can run literally whatever.
The shortness of the Run isn't as important as how much you like the game you need to find one that's short that you enjoy so you can practice it and have fun ,I suggest a snes or ps collection game though jp save 15 seconds and is much cheaper [/u]mega Man X2[/u] is the short game around 25 to 30 minutes when you get really good. There's also[/u] final fantasy 1 psp. [/u] that has an insane item glitch that give end game gear at nearly the start fun and fast.