move mouse (for some reason) to move your SOUL, Z to interact, and X to go slower. press space to become invincible I was too lazy to add the Karmic Retribution meter. This is less like an actual Undertale boss fight, and more like one of those old arcade games. Sorta. Oh yeah, something special happens when you MOO Sans. And I don't mean losing.
I take no credit for this, all I did was ruin it. the original is made by starvoid99