Ok so my idea is weird: you're falling down an actual endless pit and discover that inside this pit there is a small community of people who can help you escape. So you have to do quests for them all the while falling down the hole. Every screen would have their own tasks and some would require multiple loops around. If you miss the screen you needed to be at you'll have to loop around, but most screens will have a window of opportunity to increase a stat or coins to spend so it won't be as boring.

Here's a GIF of what I have so far: