Cool mechanic! Great presentation, too! I wasn't able to get my ratings over around 45%. Any advice?
edit: Game was rebalanced since that comment was written.Witches are basically free rating boost as long as you can one-shot enemies, so get them whenever possible and also avoid getting slimes. Crabs and heads are also undesirable. Once your hero reaches about 55% HP go for boss. I was able to get a little over 100% rating with a warrior.