After killing the dragon, I went further into the dungeon, fell into a trap and Amelia became a futa, went further down, and there were two dark elves, but nothing happened. I suspect that they were supposed to catch me. However, I couldnt talk to them, and no script was triggered. Should I just keep going, or should something happen to them?

Sounds like a bug not expected. After "getting captured by the two dark elves" the party is supposed to become split up where the MC becomes a prisoner and you end up controlling Amelia as a Futa and S'rami as a 2- team Parry and have to fight some minotaurs and inside their cell.

Yes, it was a bug, I started over and the dialog started. However, it was a pity there was no dragon at all (