Terraria for sure, it took maybe 30 minutes and I was hooked for days until I beat it. I still come back every few years to do it again

A bit late, but hypixel skyblock may fit (it’s a minecraft mmo based on 1.8.9) which has many idle game components and many ways to play while active

Really excited to see how this turns out. I think I would have loved just a standard skyrim type rpg from obsidian, but this direction shift makes it even more appealing.