Sound works fine for me. Also kinda like the battle system , it requires you to strategize instead of just spamming attacks. the boss battles are really challenging.
The healing is not always done last , it's random I think
There is some luck involved but it sounds like you're the unluckiest man alive if you're suffering this much XDDD
Maybe start carrying clovers around lol
Or rabbits tails or any luck boosting items I dont know but seriously you can increase your luck scientifically