The shield in the Kindness phase only blocks attacks from the front . If a spear comes from behind you, you must spin the shield using the arrow keys (or mouse wheel in some sims).
: The boss was a collaboration between Toby Fox (programming) and artist Everdraed. Everdraed used photoshopped images and baked animations to create the "unsettling" photorealistic style that stands out from the rest of the game's pixel art. Omega Flowey Fight Simulator