Space - Slash Z - Heal Filling your DETERMINATION up to 100% grants you more speed, less slash cooldown, and regeneration. You can fill your DETERMINATION by attacking Scratch. If he dodges, you're given 2 DT. If you hit him, you're given 4 DT.
Hold 'x' as you click the flag to skip the intro cutscene. He has five phases. Click the flag twice when starting (after a death and in general). Good luck, and give me feedback if you'd like.