It's lovely to hear that you enjoyed the game!
Regarding the BGs, we do wish we could have been more consistent with them but at that time we were relying on what we could find freely available or as an asset pack which led to many differing BG sources. We would like to update them at some point, but we are prioritising making new games so there's no guarantee if or when that will be possible.
You can check out the walkthrough for the ways to get max points on the puzzles HERE