DO NOT FUNKING STEAL
Idea 1: Friday Night Funkin' mod that starts out normal, but eventually BF just decides to rap against YOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOUYOU
Idea 2: That one secret hairy guy from Undertale as a boss fight
Idea 3: Undertale: Determinator's Story; A story that takes place 19 years after the True Pacifist ending, a half human-half monster child falls into the ancient Underground, which has devolved into caverns and dust-covered ruins.
Meet new pals, discover some areas in the underground (old and new), and survive in this much darker and bleak version of the Underground! Will you be their angel and reignite the flames of hope, or will you extinguish what embers remain and slaughter them all?
Idea 4: Terraria mod with loads of cool ancient weapons!