Cool concept! I really dig that the Ui sounds are there and sound great! Has a neat vibe, if only the timer didn't bring the amount of stress it does! :D
The room changer is neat, as is the voice acting like previously mentioned (good job on actually putting a story together!).
There are points where important information can get lost (eg number of drinks) and these prompts can not be played back after the conversation has progressed?
