the ceiling diagonal dash jump is a tech in chirpy reverie that saves time in the speedrun, makes some rooms easier in the post-game, and is required to beat pink paint pavement. it's based on timing the jump when you hit the ceiling - you have 3 frames (0.1 seconds) to get up to a ceiling and then hit jump. cddj-ing is easier and more spammable if you're closer to the ceiling. it's not a bug, it's a feature
turn tap jump off track is Dawning Bliss from the chirpy reverie full ost (an extra track, the second to last one in the video) subscribe to scratchrunning