Yeah that build is interesting haha. We currently have timeout after 2 mins which compares the hp pools and if you have more you win. But I might add an end battle button that pops up after 2 min instead so you get the choice :)
I guess that's a more futureproof way to do it. Currently the end boss doesn't have any sustain, so a soft lock isn't possible. Which means you don't really *need* the timeout, and could just remove it. But I'm guessing that would cause issues on other/future bosses that may just be able soft lock you with sustain.