Greetings, I hope the game isn't broken. Unless it's some kind of bug I'm not yet aware of.
Generally speaking, there are evets that trigger through time while others trigger through certain progress. The save warning should mean one thing: There is a time-based event coming up that's planed but not in the game (next Xici-Event I assume), which would add triggers that will miss on a later date then. Any save-game beyond that date will probably cause errors in the next update or have you miss content. You can still continue playing, just not use that save created later on.
If you haven't recruited Stella yet, that means however there is a lot of content left. Reaching Strength-Level 3 opens up many possibilities and activities in the world along with scripted events. Recruiting Stella at the brothel and having reached the Strength-Requirement will check the condition for the next Level.