As I said in the last news, I slowed down due to study. It isn't still over, but With end September I would start to implement scenes and an editor.
Now the program render and display a list of layers defined on a top level list, with the new tip the layers' list will be contained in an element of a new list, so it will be possible to move between scenes with different backgrounds, grids and entities.
The program will have to render and free the surfaces when moving between scenes and so it will be not a immediate task but It shouldn't be an hard work either.
Also I should start create an editor for change the entities and layers displayed. This probably require many modifies in the sdl.lisp but I have already some ideas to handle it.