Although this level can be easily completed if you have enough food in your inventory (or the Quen shield that restores health when you take damage), some people may find themselves unable to complete this level of the Witcher 3 due to lacking a way to heal. There is an easy way around this!

If you find a fire in an abandoned home, it will heal you up to full very quickly. You simply have to slide to the houses that have fires inside.

I hope that this helps anyone who has found themselves stuck on this mission. Through Time and Space is one of the coolest missions in the Witcher 3 and has a lot of great visuals and unique scenery.