Idle Island: Build and Survive drops you alone on a desert island with nothing, and the whole game is the climb out: mining for resources, crafting tools that make mining faster, gathering food, and eventually building a house.
It's an idle game, so progress continues while you're away — but the survival framing gives the numbers something to mean.
Gather basic resources and craft a better tool. Tool upgrades multiply everything that follows, so grinding with the starting tool wastes time.
Yes — it's an idle game, so collection continues while you're away.
Yes — a light browser game with nothing to install.