Thanks for the comment! We’re really glad you liked the visuals - we were thinking of adding a bit of background and showing the props you can purchase, too 🙂
As for the music, as mentioned elsewhere, it was simply a matter of the time we had left to implement the final features (we had a long list, but we ended up running out of time because of some home renovation work!).
The stress bar may also be affected by a bug that allows it to go below zero, so if you buy many stress-reducing items it can take a long time before it rises again and becomes visible.
Invoices usually appear as soon as you finish a task and can be clicked from behind the desk. Unfortunately, some clients pay so little that even working for a long time isn’t enough to make ends meet - just like in a translator’s real life ^__^