Hi SilverAlphaWolf,
to find out how to unzip files, please have a look at this article: https://www.lifewire.com/zip-file-2622675

Thank you for letting us know, we will fix it as soon as possible! Thanks for playing NIVA!

As long as there is no patch for the mouse sensitivity, please configure your mouse sensitivity via the options of your operating system. If you have a gamepad, take this for optimized input controls. Thanks for playing!

[light spoiler] Your goal is to jump through the ring shaped trees, but most of them are not accessible due to the infestation. Solve the problems within the area to get rid of the infestation. You do this by observing your surroundings closely and making use of your abilities to nurture and wither. And thanks for playing!