I understand, I’ll try to explain. This file called “novas” is an Aseprite file, a specific software for people who make pixel art. I’m sending this file along to make it easier for anyone who wants to edit or play around with the drawings.
The files you’re looking for are PNG files. If you want, for example, the ice animation, get the file called “Ice-Sheet,” drag it into Unity in the Project tab (at the bottom, where the folders are).
Now click on the image you just dragged in. On the right, in the Inspector tab, some settings will appear. There will be a button labeled SPRITE EDITOR — that’s the one you use to slice it. It will open a new window with the image; click Slice at the top of this new window, then click Slice again a little below, click Apply in the top right corner, and you’re done.
I know it sounds like a lot when explained like this, but it’s actually a pretty simple process. If you need anything, just let me know.