Hi, thanks for your feedback. I tried to make saving available in all events in the latest updates, and now this tab is always accessible when you’re outside the sandbox. In the sandbox itself, it’s simply impossible to add the save option — it would overlap with other buttons. I tried to solve this issue by adding a save button to the computer instead.
As for interactions and similar features, I think that’s because there have only been a few updates so far — just three. Over time, I believe the game will gradually fill up with content, and the sandbox won’t feel as empty as it might seem right now.