I made this crude representation of what issue I think to have spotted with the armour and could be the reason as to why people are saying he has buzz lightyear proportions.
This is constructive criticism as I really like the style the proportions just aren’t sitting well with me.
The image explains that the main proportional issue is how MCs arms are recessed into his chest making his arms look small and chest huge especially from the back, he needs to have his shoulders moved outwards and perhaps his arms longer to make him look less stubby. Its not that his armour itself needs to be broarder its more the mans shoulders in the suit need to be broader.
https://imgur.com/ejZ8KO7 Ill make a proper photoshop fix when I get time to illustrate my point further but hopefully you can gather what I mean.