Idea number #1: you can make a timer for 10 seconds and they have to do the puzzle before the timer ends Idea number #2: make a quiz about stuff and when they pick the wrong answer they lose Idea number #3: make a boss battle where you start as a player and you have to fight the boss which is the clock... With hands and feet... Idk you make the boss Idea number #4: make a maze and with a timer for 20 seconds and when the timer runs out they lose, also random enemies will attack you while trying to get out from the maze Idea number #5: rhythm game which you gotta listen to the beat and tap with the beat, but if you make a mistake you lose a heart, also you have 3 hearts so be careful.

A Obby but you have to rewind if there is no platform bc the platform is invisible but visible when you rewind and you should add anti rewind stage/background, double jump block/stage, random choosing time stage, kill block, kill wind ( if you wind it you have 1 chance to not use that again, if you wind it again it Will kill you instantly) glass, strengh (if player don't use rewind 3 Times) killing creature, teleport wind ( player can use this in tricky / hard situation ) double wind ( can wind it 2× ) random wind / clock ( it Will give you random wind like teleport wind, kill Wind. Etc Vent system And thats all my idea :D !

Soo COOL maybe it can be a lost in time type of game

Maby a game where your HP is Also your time to beat a level or fight a boss/enemy's?

a time traveler who collects fragments of an ancient stone to gain the power of the universe, space and time

Time power