Thank you for your detailed feedback :) This helps a lot!
When creating the assets I actually spent a bit too much time trying to get that papercut look and ended up not having enough time to draw more different objects. Definitely a scheduling problem :D
A lot of people didn't like the error sound and now that it's been said, I can't ignore it anymore... Unfortunately, it was the first sound we added, so I think we just got too used to it. :(
We have taken the subject very seriously, so there is not really a proper ending and it remains an endless loop. But in hindsight I also think that different endings would have been kind of cool. :)