The demo's haven't been updated yet those are still the same version as the HTML one so that bug hasn't been fixed yet. It's just a small error of the wrong screen showing up, you would have to click what you're trying to do on the left to get the correct interface.
That's weird Exit Game should work, it's on a bit of a delay it doesn't close out immediately.
Those are buttons on the left? Why does the save window have one (it only has one that says save)? Clicking load or autosave on the load screen does not give any indication they are doing anything. No sound or visual cues, nothing.
I hope this is fixed for the update you are currently working on.
To my knowledge, the title screen's load button does work as intended, and just the one during gameplay doesn't.