The text bug happened with Ismail. The first and second thing he said both appeared at the same time in his speech bubble.
I played again and the text bug didn't happen that time... but when I chose the murderer at the end, nothing happened. The screen was just stuck in the office with the message about no one knowing Ahmet lived in the neighbourhood.
I used Firefox both times.
Good luck with it! Like I said, it's a great concept for a short language learning game.
Great to hear you enjoyed the first part. Don't worry, there's lots more to discover.
You mean the 'old key'? You'll need to do the mini quest of the lost guy, Mr Ryan, before you can find what that unlocks. By the way, even his name is a very subtle hint.
Combat? What combat? It's a peaceful walk in the park... or is it? ;)
But just in case... the place where you use the key will give you a few hints about where to look. Also, listening near the statue in the middle of the park isn't a complete waste of time. To be fair, there is something that is not visually obvious and (very?) hard to find. Just make sure you're searching in the right area. Have fun!