Yup, useful tips are useful
. Certainly I've used this thing for a very long time for so many parts of game development, accumulating a number of good habits in the process.
By the way, is there any color that serves as a transparent background for the .png image export? At least I found out that it is easy to open the .png in another program (i.e. GIMP) select the empty black background and delete it.
Unfortunately, no. Even if I did set a color that could do this, I'm not really sure about adding transparency to a .png image, to be honest. For now I'd just say... use a supplementary program as you are :/. I'll add that to a list of things to look at at some point, but there are quite a few higher-priority items on that list already. (Technically we could just say that the hot pink transparency color on layer 0 becomes transparent in the final image, so we wouldn't need a second color.)