I don't think ingot is required and for suckerpunch he is considered a boss but you can skip to the clog once you kill him and kill the clog if you already have a plunger so you don't need to wait for him to give you one

Some suggestions you should probably turn up your bitrate in OBS and make the timer smaller since it takes up alot of screen space and timer starts on first frame of the classroom being visible and ends after defeating the last boss