Spoilers

I am at the final scene at the nuclear reactor core. Fay cannot move after giving the algae to Salvador.

This normally wouldn't be a problem because I am really good at saving, but I am on my Continue because saving stopped working a couple chapters ago!!

Same, stuck in the bar...

OK, these last two are solvable. Lay some keys back on the table, then you can move again.

I suppose the devs wanted Bent not to leave because the Guard wouldn't let him go with the keys. But you can bypass that by double-clicking on the far-right exit (the screen must shift to the right before).

No idea about the nuclear reactor core though.