Hey don't go with unity or ren'py if you don't want to be forced to learn a little bit of code and ALOT of trail and error.
tyrano builder is the best for people that are artists and not coders.
It has an easy to understand drag and drop interface, everything is color coded an in it's own little box.
It has issues like you can't make anything over a gig without manually packing it or when adding too many assets at once, because it will crash.
I chose tyranobuilder over the more popular and free engines because of it's ease of use.
Check out my demo if you want ....a demo. LOL
Search, "The Surfeit.'
GOOD LUCK!