Well maybe the spikes would still be flat enough against his oversized chest they would just be moderately uncomfortable.
Can’t really say I see anything wrong with him. We don’t have any real demons to compare him to so I’d say he gets the job done nicely. Eyes that look like they glow, horns in more places than is natural, giant muscles, a skull thing on one shoulder, and I think he even breathes out cinders!: this is one guy I definitely would not want to meet in an alleyway! I gleefully look forward to people scaring people with him.