There it is, sub40 is real. Didn't take long at all, but I'm not gonna improve it further, I have other business. Funnily enough, I did this twice in a row, first run's recording was screwed by antivirus. Thanks, Avast.

This run introduces 2 breakthrough strats, cave skip in cliff1 (thanks pingtoe for the tip) and plant jumping sequence skip in swamp1. Also minor improvements like flip cancelling.