i like this! to reiterate what other people have said, i'd love to see an endless mode
I'll continue contemplating this! There are some design reasons I'm tempted not to do this -- the main one is basically that I think that the current game design creates a lot of "near misses" -- runs ending in 5 thralls but not 6 -- which I think are very compelling.
However, a lot of people clearly like the game and want to play more of it, and I think many people like the feeling of safety that comes with keeping a character.