Removes the speed penalty while jumping/falling; jump/fall horizontal speed is now the same as that of walking and hovering. Makes the game faster-paced and feel more like the Game Boy port.
Does make the game easier, notably it relies less on pixel-perfect jumps, again making it more similar to the Game Boy games which are more forgiving in this regard.
ROM / ISO Information:
Database match: Gargoyle's Quest II (USA)
Database: No-Intro: Nintendo Entertainment System (v. 20180803-121122)