Thanks for your comments.
The bugs I think have been resolved in the new version of the game.
The rock collisions I think are correct. If on some occasions it seems that the player is not touched, it is because it immediately goes to the death sprite which is smaller.
I have not been able to reproduce the death error for touching an empty character. Sometimes the rock is touched just at the moment when it disappears under the water, maybe it is the error that you report
The Vice monitor opening error has never happened to me. The version of Vice I use is 3.6
Thanks again and regards.