A decent run.
I've only played this challenge for a total of about 30 minutes, so I've not really practised much.
I actually didn't find out about the first secret door until maybe my last 10 attempts? So I had just found it when I did this run.
Not a single major mistake was done in this run. I've found all tricks that is used in the run by myself. When you reach the end with the canon, throw it while you're still in the process of jumping upwards, this will help you reach the bonus door faster. I swallowed the upper key in the room with 2 keys. It saves a decent amount of time. When you get the boots for the second time, you have just enough time to jump into the lava beam and perform a jump, allowing you to continue faster.