Overdepth

It plays while you're doing something else
Overdepth is an idle loot RPG that lives in a thin strip above your taskbar. Not a window to keep on top of — a line at the bottom of your screen where a small figure is fighting something you can't quite see. You send them down, you go back to work, and a few minutes later there's a new bow in the tray.One decision, made over and over
How deep do you send them? Deeper is meaner, and meaner drops better — rarer things, things with names. Deeper is also where your character stops coming back. A lost run costs nothing but the time it took, so the question is never "can I afford this", it's "am I ready yet".

Then something drops that doesn't raise a number but changes a rule. Healing stops working entirely, and everything you swing hits twice as hard. Every blow lands as a critical, and every blow lands for less. Armor stops protecting you and starts healing you.

There is no correct build to go and look up. Armor, evasion, crit, lifesteal, flat damage — all of them get deep, and none of them gets deep the same way. So you pick one because you like how it fights rather than because a guide told you to, and you keep three of them at once so you can change your mind without unpicking anything.

Eventually the ladder stops having a bottom, and the only thing left to measure yourself against is the leaderboard. You can open anyone on it and see exactly what they were wearing when they got there.Built to be ignored
It keeps going while it's closed and catches you up when you're back. Every depth you reach stays reached, and gear you outgrow becomes the dust that improves the gear you kept — nothing that drops is wasted. No ads, no energy, no timers. Fold it down to a line and forget about it for a day. It'll still be down there, going deeper.