Hi. Game unzipped and opened fine for me, though I usually have no issues unzipping .rar files which does not seem to be true for everyone since I have seen this issue in other games. Might depend on your device and if you use 7zip. I'm on a PC and did use it.
I tried out the game in exploration mode and loved the visuals for the menu and various worlds. The best worlds were the ones with tall structures to inspect. The more empty worlds felt more like you were in the middle of nowhere and not really going anywhere. Probably stands out a lot less in survival mode, which I am going to try later.