This was a thin North American style chocolate pudding. (We call custard desserts "pudding here). Very silky texture. Looked exactly like the picture.
It was not sweet at all, so if you prefer a sweeter custard, at least double the sugar (it calls for 20g), if not triple it. I used 72% dark chocolate and although it was sweet enough for my adult palate, my DD disliked it greatly (she's 7). Big thumbs down from her.
I added the optional egg that is called for in the recipe, next time will make it without and see what a difference it makes.
If you're making this for adults who like custards that are not too sweet, then 5/5.
If making for children, then 1/5 as written with the 20 g of sugar.