Thank you for your feedback!
I did realise this could be a problem. Originally, this was Six Minutes of Existence, and each body 'bead' corresponds to how many minutes you have left.
When I realised 6 minutes wasn't nearly enough time, I bumped it up to 10 – and with 10 beads, it was quite annoying. So, I set the limit to 6 and each body only starts falling off when you have less than 6 minutes. I never tried only having the head as the hitbox, but maybe I should've, since that would make it much easier navigating through the tight tunnels (especially if an unfortunate bomb spawns there).