>>713939782
>1)
My computer is from 2011, I haven't a single problem running this.
>2)
Platforming exploration/treasure-seeking ones, but Noita is probably the only open-world one.
>3)
~2 minutes to 60 hours
4)
A little: You can unlock spells and permanent changes to the world generation (small features/rooms) but the spells are rather easy to get hold of. The main thing is learning to handle the wand crafting and the world layout (areas/biome placements are always the same, it's the layout, content and loot of those areas that change).