I'm not planning to add any explicit animations like that. I want to keep it cute and wholesome, and not add anything that would by itself look very out of place in, say, a Yoshi or Kirby game. And even if people really really want me to add it, I'd make it so that you would need to actively turn it on to see it, but off by default.
I'm also designing the game so that on the regular difficulty, enemies can't kill the player in any way, only steal their taste level (= strength). So as soon as there are more areas and stronger bosses, I'll balance it so that the player can't defeat a boss while having a too low level, even with no player death. So failure on a boss would not mean dying, but to get so weak that you can't damage them anymore, and you have to retreat to level up.
While there is nothing wrong with people liking violent games, this is made for (and by) people who don't. So if there will be anything that makes a player uncomfortable in the game, I'm asking them to please let me know. I will try my best to add a toggle to turn those off, or where that is not possible at least a warning. Let's keep this space safe for everyone.