I can't really speak for how much the game has improved, since I wasn't able to play it at launch thanks to its abysmal optimization at the time. I can say that it is a good game now. There are a couple caveats, though.
First, don't buy it at full price. The devs are still updating it, so maybe it will be worth $60 someday, but not right now. Luckily, it goes on sale for 50% off a few times a year. At $30, it's probably worth it.
Second, this game is effectively still in Early Access. It still receives major updates overhauling substantial parts of the game, and it's still packed full of the kind of annoying-but-tolerable bugs characteristic of games in beta.
If you still want it knowing the above, go for it.

I can't really speak for how much the game has improved, since I wasn't able to play it at launch thanks to its abysmal optimization at the time. I can say that it is a good game now. There are a couple caveats, though. First, don't buy it at full price. The devs are still updating it, so maybe it will be worth $60 someday, but not right now. Luckily, it goes on sale for 50% off a few times a year. At $30, it's probably worth it. Second, this game is effectively still in Early Access. It still receives major updates overhauling substantial parts of the game, and it's still packed full of the kind of annoying-but-tolerable bugs characteristic of games in beta. If you still want it knowing the above, go for it.