FYI your Youtube link is timestamped at 72s.
Also, 'World's first Celestoidvania'... π€¦
I'm not sure what it is either, but I feel like so many unnsuccessful or unmemorable Metroidvanias bank too much on early Protag designs. Their worlds are usually nicely fleshed out, NPCs look great, but MC always looks so dull.
There's a reason why memorable Metroidvanias all have either unique settings or unique MC designs. Banking on generic self-inserts just having lasting impact in the genre.