I thought about adding either more levels from Mario 64, or even other N64 games, but currently I don't find the time to add more.
Adding difficulty to these scenes is a challenge since N64 games generally have fairly simple or empty levels, so it is often quite easy to notice when something changed.
But I think it's okay to have an easier Observation Duty game compared to the usually very cluttered ones.
And don't worry, comments are always welcome!