The slime splits to smaller slimes and only the final tier(8 small ones) takes chunks off HP, This was a complaint in the last demo so I added hit sounds and visual effect to make it clearer that damage is done.
presumably when players start the game they learn to associate those with damaging enemies on enemies that die faster so they don't think the slime is invulnerable.
As for the orca / all bosses, I'll add a small buffer to allow players to get ready before the fight starts. I doubt I'll nerf the difficulty much, I want my game to have some brutal difficulty(and I confirmed it beatable). thanks for the feedback. "heavenly masterpiece" is just a joke name because itch asks what you want your project to be called when people launch it.