> I wouldn't build killing tools casually despite having, as most engineers here do
No, most engineers here are perfectly fine building highly addictive apps that are only slightly removed from slot machines and targeting them at children.
> The concept itself is not novel
Actually building it is very novel.
> It's explosive charges strapped to an helmet with a detonator
That is triggered when you lose a video game.
> the form is not particularly appealing or interesting
Given the amount of engagement and discussion it's generating I think you are clearly wrong.