I enjoyed the video a lot, but it feels a bit fictionalised. The first fifteen minutes talking about how hard it was to get another character, then immediately after adding shadownman the vizier is added, then unmentioned but shown at 16:21 there's a new skeleton enemy which is clearly a completely different bitmap from any other character.

That's a heck of a lot of space to suddenly find when adding a single extra character was seemingly untenable.