The controls are: arrow keys to move, z to confirm, x to speed up dialogue and cancel. When you lose, click the green flag to restart.
Thanks to Toby Fox for creating Undertale.(His sprites and music are used in this game) And thanks to @pococikapusta for creating the battle creator, and @sadman00 for remaking it. Log, 18/1/22 Temmiefied the monster dialogue, made sure Temmie would attack, removed the game over text, (Except for the giant unremovable game over.) and changed the name to "Temmie fight (Undertale)". 19/1/22, Temmiefied the monster dialogue even more and added the words "You feel confused", to the menu text. 20/1/22, Found out the monster text, and "You feel confused", didn't change.(It's fixed now)