Perhaps you should look at the first post again.
" Developer: VersusX "
N7, the thread creator can not add anything whatsoever other than updating the download links others provide.
As for lack of reading, the status of the save feature has been discussed and answered many times before in this thread and on the actual developers patreon and blog website, or, in the upper right you'll see something called a "search" function.
In summary, its a basic tech demo with only a few levels which is changing so the save feature is only keeping track of unlocks perrelease and won't be implemented until the code base is established in the game proper.