The saves are encrypted. Commence eye-rolling, but saves cannot be easily shared without some hacking skills.
What makes it garbage to you? There is a lot to do and a lot to see. Those things might not be to your taste, but to claim there's nothing to do and nothing to see is simply false.
The game was originally released with only Kate as the MC. When there was some noise about people not liking female protagonists, they introduced Alex, and then other patrons complained that was a waste of time. So DS did a poll a few weeks ago: 53% wanted
only Kate developments and 85% preferred focusing
mostly on Kate developments. Only 5% wanted mostly Alex developments, so I doubt we'll be seeing any MC-Alex updates anytime soon.
There are oral/HJ/masturbation scenes with Kate and several nPCs, both guys and girls, and lots of voyeur scenes of other nPCs having sex, including anal. Kate has not had sex yet. Originally, Julia was Kate's sister, but they rewrote that because of Patreon's rules. But it's easy to play along knowing Kate and Julia are sisters, and if you count Julia giving Kate an orgasm in the shower as incest, then yes

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It's hard to answer the "Is it worth it?" question. Depends on your taste. You can download the CGs from the OP and determine for yourself?