It seems like something very simple but it took me about 5 days to get the cat to sit down when the mouse didn't move. The game is practically move your mouse and watch it follow :) If you leave it still there's a small chance that it will think of an exclamation point or a bored emoji. BUT EVERYTHING THAT HAPPENS: don't click on the cat :)
Code and art by me, music is Adventurer's Guild.