It seems quitting the game during the Game Over screen saved your HP at 0...
I fixed the issue: as soon as the build is up (and it seems to take a bit of time today...), version 1.1.1 will let you reload that save file and have a playable character. Sorry for the inconvenience!
It took a while, but the update is live: https://dreamnoid.itch.io/the-trespasser/devlog/483703/update-111-bugfix-and-hin...