I added a help button in full screen mode (and a help menu option in compact mode). And I made an
apk with a 10-day trial in case you get hooked on Compact mode and don't want to go back to the released version.
I think the help includes all the information a Kindle user might want about how to use ScreenDim, but if there are any hints I should include, let me know.
You might notice that the help on a Kindle does not mention features that don't work on a (stock) Kindle.