Glad to hear you enjoy it!
1. Yeah, the plan is to have a few (probably three) endings, each with their own small variants. Your can think of the choices as either pushing you towards a Dom path, Sub path or Rejection path, all in reference to how the MC treats Ruru.
2. No plans for any official language patches. Don't like releasing something if I can't be assured of its quality, and quality costs more than I think it's worth at the moment.
3. Ideally I'll be finishing it at some point this month, but we'll see, my rate of progress is highly volatile.
Cheers!