If you're having trouble clicking buttons, press the middle of them. Most of the instructions are said by How To Play, so you don't need this except for the update log. ~~UPDATE LOG May 23rd, 2021 - First game release, menu should be fully functioning but there is currently no gameplay. Due to this, the shop is out of order as no items can be bought without gameplay.
Credit to Toby Fox for making Undertale, his work includes the background music, map and attacks, and the annoying dog sprite.
