If you can let go that this is not a story about how to survive in the woods without much help from civilization, then you might enjoy it as the story of two sisters who.... have to learn how to survive in the woods without much help from civilization.
As soon as Dad needed to be whisked off stage so it could be only about the two sisters, you know what the story is going to be about. Characters in stories tend to die quickly when the story requires it, but the reason he died is because of poor knowledge and preparation. Operating dangerous machinery alone, not wearing protective gear, felling a live tree with a small chainsaw, not focusing on all the dead and dropped wood first (which also prevents fire hazard). At first I thought he was felling a tree to block the driveway, so people couldn't just drive up, but why waste precious gas on cutting trees with a chainsaw, when there should be plenty of deadwood to harvest with hand equipment?
Maybe his wife (conveniently off stage since before the movie) was the real prepared person in the family. How else do you explain that there's over a year's worth of rice and beans? It also explains why nobody noticed the roof caving in. A roof doesn't fail in one to two years of neglect, it takes decades so there's no excuse for dad to have missed it... unless he wasn't really the prepper in the family.
The deceased wife must also have been the hunter in the family, and I guess nobody ever showed interest in it, because the kids have no idea what to do until they have to try and learn it from books.
Still, I want to excuse all that, so we can focus on the real story of the two sisters who really shouldn't be alive any more. And then they go and burn down their last asset. Yes, black mold and roof caving in, but there's tons of useful things that can be salvaged for their next home (glass, nails and other metal objects, the books). The excuse that its to throw scavengers and thieves off their trail could have been made to work, but there were never any visitors except the two people who knew they were there, and who quickly left.
That's the problem with post-apocalypse movies, they like to focus on a variable or two (electricity) and assume everything else goes away. Even if the grid is destroyed, we're only knocked back to the 19th century, but with all our current knowledge. Civilization doesn't end, society doesn't end, governments don't end, people don't, its just been rebooted, and depending on the scenario, maybe not even all that long. Speaking of which, there's no reason why in the past year an armed group of people on horseback hasn't shown up yet, checking every property for salvage and survivors (or if a less benevolent new government, loot and slaves).
Speaking of post-apocalyptic fantasy, references to The Last of Us are too many to count, but the best one is Eva heading out to hunt to save the person back at base (that image of Ellen Page in the tree waiting for prey could be right out of the game).
