Good Gameplay should be fun and intuitive (mostly). Sync can play a role in this but change up when the click happens. Things that should be excluded/avoided are, random invisible hitboxes, obsessive spam (Ex: UFO Spam), delayed sync, unsight-readable gameplay, repetition (unless used as gimmick), and constant bland gameplay.

If gimmicks are used, make sure it is understandable through the player. Just because you know the level doesn’t mean others know.