It's finally out now on DLSite.
Here is the link to the game:
In case you encounter any troubles starting the game up, place it into C:\Paperheads, or a similar directory (D:\Paperheads, E:\Paperheads etc.).
Also you should make sure, that your drivers etc. are up to date.
Of course you should try out the demo version, before buying the game, to make sure that it runs on your system.
If you're looking for the english patch, you can get it here:
And the uncensor patch is here:
Password for both is: prowo
Beware though, that the uncensor patch contains all CG's in a folder.
(even the deleted ones!)
So if you don't want to get spoilered, don't look into the CG folder.
How to apply both patches:
Just place both file contents into the "Paperheads" directory.
Overwrite all existing files, and it should work.