Thanks for posting and giving some detailed feedback! Looking at the training section, you need to select a succubus from the left panel AND a volunteer from the right panel before training can start. A succubus is selected automatically, but not a volunteer. Please give that a try and let me know if you can enter training.
The size of the text for the buttons in the training selection panel will be updated in the next few days.
As for the options bugs, I've been trying to track down some of these for the last few days, so let me try to reproduce the exact ones you're experiencing.
Please ignore the internet access request. I'm not collecting any data on players. This seems to be Unity collecting player data through Unity Analytics, which I've just removed from the latest built (not yet on itch, sorry). When I have the latest build up, I'll post another devlog announcement. If you still get the internet access request after that, let me know and I'll take a deeper look at the other packages Unity includes by default.
Cheers,