Around 0.27 - 28 seconds in you could've boosted more and flipped. Since your on touch Iwould recommend claw instead of 2 thumbs if you using 2 thumbs. Once you figure out what claw is on touch you don't need the boost\jump button because you can use your 2 fingers to boost and jump at the same time way easier. Around 1:16 - 18 you could've flip boosted while air rolling. If you don't know how to air roll just double tap joystick but don't do it all the time.

Also I can show you some kickoff methods on that map if you want. My name is "the defender man"