Thank you for playing!
The one thing can be either the fact that you are the only living thing in the castle, or more importantly it referrs to the core mechanic of interaction. That is really the only thing you do.
"Plays Terrible" is a bit of a vague statement, but I am open to criticism. This was a 2 day effort by just me so the game isn't going to control like castlevania or something.
As for the crash, I had that happen once to me as well. I used a preview unity build, so I honestly think that is the issue. There are no crashes in editor. :)
Again, thanks for playing.