Thanks!
1. Yep. Save files should be saved in the same file folder as other versions of Hypnosis. The one exception being on Android where the new version of Ren'Py probably means losing save files, although I'm not sure there and if that's the case it would happen for any new version you play regardless if it's the premium version or not.
2. With the premium version you get early access to game updates going forward. On Patreon it only accesses what is available for as long as you are subscribed.
3. Yep, patrons get to take part in voting along with early access to bonus renders, behind the scenes info, stories, and game updates as they comes out. The online/downloadable walkthrough guide is free and posted on my website, Patreon, SubscribeStar, DeviantArt, etc.
So in general, I'd say Patreon is more meant for supporting my efforts directly. It means I don't need a day job and am able to work on the games fulltime. I try to give as much value as I can to patrons, but I also try not to be too greedy which is why the games are still posted here free.
But the Premium Edition also helps me out, and I'd say it is a better value overall, as it is a one time purchase instead of a subscription.
Thanks again for the feedback and suggestions!