Hello, this is the route I made and used for the world record run. It allows you to kill the final boss without needing to worry about damage upgrades or best weapon to use. Just one spell and some restoration potions.

https://docs.google.com/document/d/1S7MnCeceyg5aBHHV8SeX6AT7N2qisc2GsP-3s3vJvyI/edit?usp=sharing