If I could have completed it I would have made a rain world like game where you had to farm for food and then hide away before the giant wave comes and consumes and destroys everything about land. My favourite feature is the screen shaking when you get consumed by the wave :O
one other idea for the sake of progression I came up with a while ago was the wave washing up a bottle of some kind of potion that allowed you to 'level up'. It made the game harder and easier at the same time. Though critiquing my idea I could have made the good side of leveling up through washed up items that could help with progression. Dang maybe I should finish this project 😅