The saves are in the game's folder, so you must copy/paste them before deleting the old version. They are there together with the game.exe, so they should be easy to find.
That's the ending of the game. I don't know how much you did of the side content, but you probably saw a bunch of events related to how you played and which questlines you finished. You can continue playing afterward, but the ending is basically 99% finished (there might be a new questline which will be featured there in the future or maybe one more relationship will get mentioned if you got to its end, but that's about it).
If you go to the tattoo parlor you can get a tattoo for left/right arms, a tramp stamp and a pelvic tattoo (as well as some piercings). Some relationships might or drunk scenes could force one or more of these on you as well. If you become a cowgirl, you get a magical brand on your butt (I don't know if that counts as a tattoo XD).
Viewing post in Caliross, The Shapeshifter's Legacy comments
If you get pregnant (you must go to the doctor to confirm the pregnancy), you get the option to retire, and if you do, you get a slightly different epilogue depending on who's the father. No main path ending, though, since there is already a pregnancy system, I decided to keep everything related together.
The walkthrough is incomplete, but what's there should be up-to-date, and there isn't a lot missing. If you notice anything wrong or missing that you want in there, let me know and I might add it next time I update it.