Z to select Arrow keys to move The story: You and Chara erased the whole underground and there is nothing left except an error. Sans had refused to die after you and Chara erased the underground world. His soul combined with the game error, and he is now error sans. Error sans came for revenge and if he kills you, he would make his own dimension.
I think this is one of my best projects ever. Thanks to pococikapusta for the battle engine and loganvcairns for the inspiration.