Timeless Journey

You came from a terrible future, but have hope to change that. A time machine that was just invented could allow you to go back to the point where everything went wrong, and shut it down before anything bad happened. The problem? Your time machine is too unstable to send you back to the past for more than a minute. By collecting time crystals, you can temporarily increase your journey, but it will take speedy platforming, activating of beacons, and collecting coins to improve the quality of your time machine and stay long enough to save the world.