Two blocks moving into each other is never intented, that's but just a bug.
I believe it has been fixed in the version I'm working on, but thanx for mentioning it Cat.
Single mouse pointer & hotspot descriptions: has been added already in the newer version
Tutorial: never thought of it but that might be smart to add indeed.
What do you mean with the gui need a bit more work?
Or is that the mouse pointer and the hotspot naming?