Thanks for writing this! Happy you liked it, and that some of the stuff I aimed to do nailed their mark.
Didn't have time to code more solid AI in monsters, but my idea was, that in combination with buff that are limited in time, you can't get permabuffed all the time AND inflict damage AND react to monster doing big swing/status effect you. The framework is there, but it would require a bit more time to give them personality.
The heal from 0 was originally a bug, but I felt it kept the third character busy and it would perhaps be too punishing without it. But yeah, it weirded out most people, would definitely avoid this in a larger game.