I dig it as a more gritty version of 5e. The characters are less capable compared to 5e characters, but compared to each other feel well balanced. It takes away a lot of the options available to 5e characters, which some will see as a negative, but which I think can be quite refreshing.
I think as far as dungeon delving, "can we survive" type mechanics, it works well. I don't know if it's simple enough compared to some other games that go for that, like Torchbearer or similar games, as I'm not that familiar with them. But as a toned down 5e I dig it.
It's also pretty easy to take pieces of it and move them over to 5e if you like. Such as supply.