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That is exactly right.  The game tiles are stored in an array and written to the background layer.  The only sprite is the cursor, which can move or remove game tiles from that array.  And I am using the maximum amount of allowable color palettes for the system.  I had to get a little creative, so some things share the same palette, like the green game tiles and the main character portrait.   

Woah, this is an amazing idea!

Thanks for the feedback!  Glad to hear no bugs or issues.  I will update the color of the mana text.

I will research how to add a save feature.  Campaign progress is stored in just a few variables so I can't imagine it would be too difficult.  

Thank you.  You helped me solve a major crash bug in discord (I was not calling remove_VBL(hUGE_dosound) before switching banks).  Really appreciate your help and the help of everyone else on the gbdk discord.