Finally, a clicker with a plot! Instructions are explained ingame, all mouse use, probably mobile friendly, I will explain how all of it works in the notes+credits. Yes, your LV counts towards your Determination, so the more you kill, the higher your Determination per click is.
This demo only goes to the end of the ruins after you beat toriel. Every time you click at first, you gain 1 Determination. There are 3 endings, Sparing toriel, Killing toriel, and Genocide. Everytime you click on the heart, there is a 1 in 400 chance of getting a random encounter, and every time you kill 25 is added to the 400. If you have 11 kills, there is a 1 in 675 chance of a random encounter. To get Genocide, You have to kill 12 enemies. To spare toriel, you have to wait until she spares you. To kill enemies, you click on them, to spare enemies you click spare. That's it. If you have any questions, ask in the comments.